今、Brainuxの基盤側の設定を詰めています。
・カーネル最適化編
まとめ(高速化結果)
カーネルパラメータ設定
Brainuxに合わせたLinuxカーネルパラメータを調整してみました。
設定ファイルの変更
sudo vi sysctl.conf
###############################################
# Brainux ARMv5 最適化 sysctl.conf
# 目的：低RAM・低速CPU・低速I/O環境での体感速度向上
###############################################
########## メモリ最適化 ##########
# swap を極力使わない（フリーズ防止）
# レスポンス向上に有効だが、副作用が発生する可能性もあります。
vm.swappiness = 0
# ファイルキャッシュを積極的に保持（ゲームの画像・音声が速くなる）
vm.vfs_cache_pressure = 50
# 書き込み遅延を減らして I/O フリーズを防ぐ
vm.dirty_ratio = 5
vm.dirty_background_ratio = 2
# dirty 書き込みを早めに開始（SDカードの詰まり防止）
vm.dirty_expire_centisecs = 1000
vm.dirty_writeback_centisecs = 300
########## CPU スケジューラ最適化 ##########
# fork 直後の子プロセスを優先しない（カクつき防止）
kernel.sched_child_runs_first = 0
# インタラクティブ処理を優先（SDLゲームの反応改善）
# Brainuxでは設定不可
#kernel.sched_latency_ns = 6000000
#kernel.sched_min_granularity_ns = 750000
#kernel.sched_wakeup_granularity_ns = 1000000
########## ネットワーク（軽量化） ##########
# TCP バッファを小さくしてメモリ節約
net.ipv4.tcp_rmem = 4096 87380 131072
net.ipv4.tcp_wmem = 4096 65536 131072
# TIME_WAIT を減らして軽量化
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_tw_reuse = 1
########## カーネル動作の軽量化 ##########
# カーネルログの出力を抑制（ゲーム中のカクつき防止）
kernel.printk = 3 3 3 3
# カーネルの OOM killer を積極化（フリーズ防止）
vm.oom_kill_allocating_task = 1
vm.panic_on_oom = 0
###############################################
# 以上
###############################################
この設定ファイルの内容での即時反映は、以下のコマンドで可能です。
$ sudo sysctl -p
設定の確認は、以下のようなコマンドで可能です。
#個別のカーネルパラメータの表示
実行結果
user@brain:~$ sudo sysctl -a
[sudo] password for user:
dev.scsi.logging_level = 0
dev.tty.ldisc_autoload = 1
fs.aio-max-nr = 65536
fs.aio-nr = 0
fs.dentry-state = 4119 1127 45 0 216 0
fs.epoll.max_user_watches = 45331
fs.file-max = 2147483647
fs.file-nr = 1177 0 2147483647
fs.inode-nr = 4698 289
fs.inode-state = 4698 289 0 0 0 0 0
fs.inotify.max_queued_events = 16384
fs.inotify.max_user_instances = 128
fs.inotify.max_user_watches = 8192
fs.lease-break-time = 45
fs.leases-enable = 1
fs.mount-max = 100000
fs.nfs.idmap_cache_timeout = 600
fs.nfs.nfs_callback_tcpport = 0
fs.nfs.nfs_congestion_kb = 10816
fs.nfs.nfs_mountpoint_timeout = 500
fs.nfs.nlm_grace_period = 0
fs.nfs.nlm_tcpport = 0
fs.nfs.nlm_timeout = 10
fs.nfs.nlm_udpport = 0
fs.nfs.nsm_local_state = 0
fs.nfs.nsm_use_hostnames = 0
fs.nr_open = 536870908
fs.overflowgid = 65534
fs.overflowuid = 65534
fs.pipe-max-size = 1048576
fs.pipe-user-pages-hard = 0
fs.pipe-user-pages-soft = 16384
fs.protected_fifos = 1
fs.protected_hardlinks = 1
fs.protected_regular = 2
fs.protected_symlinks = 1
fs.suid_dumpable = 0
kernel.arch = armv5tejl
kernel.auto_msgmni = 0
kernel.cad_pid = 1
kernel.cap_last_cap = 40
kernel.core_pattern = core
kernel.core_pipe_limit = 0
kernel.core_uses_pid = 1
kernel.ctrl-alt-del = 0
kernel.dmesg_restrict = 0
kernel.domainname = (none)
kernel.hostname = brain
kernel.keys.gc_delay = 300
kernel.keys.maxbytes = 20000
kernel.keys.maxkeys = 200
kernel.keys.root_maxbytes = 25000000
kernel.keys.root_maxkeys = 1000000
kernel.kptr_restrict = 0
kernel.max_lock_depth = 1024
kernel.max_rcu_stall_to_panic = 0
kernel.modprobe = /sbin/modprobe
kernel.modules_disabled = 0
kernel.msgmax = 8192
kernel.msgmnb = 16384
kernel.msgmni = 32000
kernel.ngroups_max = 65536
kernel.oops_limit = 10000
kernel.osrelease = 6.1.70-ga9f534c7f53e
kernel.ostype = Linux
kernel.overflowgid = 65534
kernel.overflowuid = 65534
kernel.panic = 0
kernel.panic_on_oops = 0
kernel.panic_on_rcu_stall = 0
kernel.panic_on_warn = 0
kernel.panic_print = 0
kernel.perf_cpu_time_max_percent = 25
kernel.perf_event_max_contexts_per_stack = 8
kernel.perf_event_max_sample_rate = 100000
kernel.perf_event_max_stack = 127
kernel.perf_event_mlock_kb = 516
kernel.perf_event_paranoid = 2
kernel.pid_max = 32768
kernel.poweroff_cmd = /sbin/poweroff
kernel.print-fatal-signals = 0
kernel.printk = 7 4 1 7
kernel.printk_delay = 0
kernel.printk_devkmsg = on
kernel.printk_ratelimit = 5
kernel.printk_ratelimit_burst = 10
kernel.pty.max = 4096
kernel.pty.nr = 4
kernel.pty.reserve = 1024
kernel.random.boot_id = c625ee00-916c-473e-8292-740bf8d2600d
kernel.random.entropy_avail = 256
kernel.random.poolsize = 256
kernel.random.urandom_min_reseed_secs = 60
kernel.random.uuid = 87d94d07-823b-41c6-b70f-6eb01012eb60
kernel.random.write_wakeup_threshold = 256
kernel.randomize_va_space = 2
kernel.real-root-dev = 0
kernel.sched_child_runs_first = 0
kernel.sched_deadline_period_max_us = 4194304
kernel.sched_deadline_period_min_us = 100
kernel.sched_rr_timeslice_ms = 100
kernel.sched_rt_period_us = 1000000
kernel.sched_rt_runtime_us = 950000
kernel.seccomp.actions_avail = kill_process kill_thread trap errno user_notif trace log allow
kernel.seccomp.actions_logged = kill_process kill_thread trap errno user_notif trace log
kernel.sem = 32000 1024000000 500 32000
kernel.shm_rmid_forced = 0
kernel.shmall = 4278190079
kernel.shmmax = 4278190079
kernel.shmmni = 4096
kernel.sysctl_writes_strict = 1
kernel.tainted = 0
kernel.task_delayacct = 0
kernel.threads-max = 1799
kernel.usermodehelper.bset = 4294967295 511
kernel.usermodehelper.inheritable = 4294967295 511
kernel.version = #1 PREEMPT Tue Mar 24 17:57:31 UTC 2026
kernel.warn_limit = 0
net.core.busy_poll = 0
net.core.busy_read = 0
net.core.dev_weight = 64
net.core.dev_weight_rx_bias = 1
net.core.dev_weight_tx_bias = 1
net.core.devconf_inherit_init_net = 0
net.core.fb_tunnels_only_for_init_net = 0
net.core.gro_normal_batch = 8
net.core.high_order_alloc_disable = 0
net.core.max_skb_frags = 17
net.core.message_burst = 10
net.core.message_cost = 5
net.core.netdev_budget = 300
net.core.netdev_budget_usecs = 20000
net.core.netdev_max_backlog = 1000
net.core.netdev_rss_key = 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
net.core.netdev_tstamp_prequeue = 1
net.core.netdev_unregister_timeout_secs = 10
net.core.optmem_max = 10240
net.core.rmem_default = 180224
net.core.rmem_max = 180224
net.core.skb_defer_max = 64
net.core.somaxconn = 4096
net.core.tstamp_allow_data = 1
net.core.txrehash = 1
net.core.warnings = 0
net.core.wmem_default = 180224
net.core.wmem_max = 180224
net.ipv4.conf.all.accept_local = 0
net.ipv4.conf.all.accept_redirects = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.arp_accept = 0
net.ipv4.conf.all.arp_announce = 0
net.ipv4.conf.all.arp_evict_nocarrier = 1
net.ipv4.conf.all.arp_filter = 0
net.ipv4.conf.all.arp_ignore = 0
net.ipv4.conf.all.arp_notify = 0
net.ipv4.conf.all.bc_forwarding = 0
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.conf.all.disable_policy = 0
net.ipv4.conf.all.disable_xfrm = 0
net.ipv4.conf.all.drop_gratuitous_arp = 0
net.ipv4.conf.all.drop_unicast_in_l2_multicast = 0
net.ipv4.conf.all.force_igmp_version = 0
net.ipv4.conf.all.forwarding = 0
net.ipv4.conf.all.igmpv2_unsolicited_report_interval = 10000
net.ipv4.conf.all.igmpv3_unsolicited_report_interval = 1000
net.ipv4.conf.all.ignore_routes_with_linkdown = 0
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.all.medium_id = 0
net.ipv4.conf.all.promote_secondaries = 0
net.ipv4.conf.all.proxy_arp = 0
net.ipv4.conf.all.proxy_arp_pvlan = 0
net.ipv4.conf.all.route_localnet = 0
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.all.secure_redirects = 1
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.all.shared_media = 1
net.ipv4.conf.all.src_valid_mark = 0
net.ipv4.conf.all.tag = 0
net.ipv4.conf.default.accept_local = 0
net.ipv4.conf.default.accept_redirects = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.arp_accept = 0
net.ipv4.conf.default.arp_announce = 0
net.ipv4.conf.default.arp_evict_nocarrier = 1
net.ipv4.conf.default.arp_filter = 0
net.ipv4.conf.default.arp_ignore = 0
net.ipv4.conf.default.arp_notify = 0
net.ipv4.conf.default.bc_forwarding = 0
net.ipv4.conf.default.bootp_relay = 0
net.ipv4.conf.default.disable_policy = 0
net.ipv4.conf.default.disable_xfrm = 0
net.ipv4.conf.default.drop_gratuitous_arp = 0
net.ipv4.conf.default.drop_unicast_in_l2_multicast = 0
net.ipv4.conf.default.force_igmp_version = 0
net.ipv4.conf.default.forwarding = 0
net.ipv4.conf.default.igmpv2_unsolicited_report_interval = 10000
net.ipv4.conf.default.igmpv3_unsolicited_report_interval = 1000
net.ipv4.conf.default.ignore_routes_with_linkdown = 0
net.ipv4.conf.default.log_martians = 0
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.default.medium_id = 0
net.ipv4.conf.default.promote_secondaries = 1
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.conf.default.proxy_arp_pvlan = 0
net.ipv4.conf.default.route_localnet = 0
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.default.secure_redirects = 1
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.default.shared_media = 1
net.ipv4.conf.default.src_valid_mark = 0
net.ipv4.conf.default.tag = 0
net.ipv4.conf.enx3495db26e312.accept_local = 0
net.ipv4.conf.enx3495db26e312.accept_redirects = 1
net.ipv4.conf.enx3495db26e312.accept_source_route = 0
net.ipv4.conf.enx3495db26e312.arp_accept = 0
net.ipv4.conf.enx3495db26e312.arp_announce = 0
net.ipv4.conf.enx3495db26e312.arp_evict_nocarrier = 1
net.ipv4.conf.enx3495db26e312.arp_filter = 0
net.ipv4.conf.enx3495db26e312.arp_ignore = 0
net.ipv4.conf.enx3495db26e312.arp_notify = 0
net.ipv4.conf.enx3495db26e312.bc_forwarding = 0
net.ipv4.conf.enx3495db26e312.bootp_relay = 0
net.ipv4.conf.enx3495db26e312.disable_policy = 0
net.ipv4.conf.enx3495db26e312.disable_xfrm = 0
net.ipv4.conf.enx3495db26e312.drop_gratuitous_arp = 0
net.ipv4.conf.enx3495db26e312.drop_unicast_in_l2_multicast = 0
net.ipv4.conf.enx3495db26e312.force_igmp_version = 0
net.ipv4.conf.enx3495db26e312.forwarding = 0
net.ipv4.conf.enx3495db26e312.igmpv2_unsolicited_report_interval = 10000
net.ipv4.conf.enx3495db26e312.igmpv3_unsolicited_report_interval = 1000
net.ipv4.conf.enx3495db26e312.ignore_routes_with_linkdown = 0
net.ipv4.conf.enx3495db26e312.log_martians = 0
net.ipv4.conf.enx3495db26e312.mc_forwarding = 0
net.ipv4.conf.enx3495db26e312.medium_id = 0
net.ipv4.conf.enx3495db26e312.promote_secondaries = 1
net.ipv4.conf.enx3495db26e312.proxy_arp = 0
net.ipv4.conf.enx3495db26e312.proxy_arp_pvlan = 0
net.ipv4.conf.enx3495db26e312.route_localnet = 0
net.ipv4.conf.enx3495db26e312.rp_filter = 2
net.ipv4.conf.enx3495db26e312.secure_redirects = 1
net.ipv4.conf.enx3495db26e312.send_redirects = 1
net.ipv4.conf.enx3495db26e312.shared_media = 1
net.ipv4.conf.enx3495db26e312.src_valid_mark = 0
net.ipv4.conf.enx3495db26e312.tag = 0
net.ipv4.conf.lo.accept_local = 0
net.ipv4.conf.lo.accept_redirects = 1
net.ipv4.conf.lo.accept_source_route = 0
net.ipv4.conf.lo.arp_accept = 0
net.ipv4.conf.lo.arp_announce = 0
net.ipv4.conf.lo.arp_evict_nocarrier = 1
net.ipv4.conf.lo.arp_filter = 0
net.ipv4.conf.lo.arp_ignore = 0
net.ipv4.conf.lo.arp_notify = 0
net.ipv4.conf.lo.bc_forwarding = 0
net.ipv4.conf.lo.bootp_relay = 0
net.ipv4.conf.lo.disable_policy = 1
net.ipv4.conf.lo.disable_xfrm = 1
net.ipv4.conf.lo.drop_gratuitous_arp = 0
net.ipv4.conf.lo.drop_unicast_in_l2_multicast = 0
net.ipv4.conf.lo.force_igmp_version = 0
net.ipv4.conf.lo.forwarding = 0
net.ipv4.conf.lo.igmpv2_unsolicited_report_interval = 10000
net.ipv4.conf.lo.igmpv3_unsolicited_report_interval = 1000
net.ipv4.conf.lo.ignore_routes_with_linkdown = 0
net.ipv4.conf.lo.log_martians = 0
net.ipv4.conf.lo.mc_forwarding = 0
net.ipv4.conf.lo.medium_id = 0
net.ipv4.conf.lo.promote_secondaries = 1
net.ipv4.conf.lo.proxy_arp = 0
net.ipv4.conf.lo.proxy_arp_pvlan = 0
net.ipv4.conf.lo.route_localnet = 0
net.ipv4.conf.lo.rp_filter = 2
net.ipv4.conf.lo.secure_redirects = 1
net.ipv4.conf.lo.send_redirects = 1
net.ipv4.conf.lo.shared_media = 1
net.ipv4.conf.lo.src_valid_mark = 0
net.ipv4.conf.lo.tag = 0
net.ipv4.conf.sit0.accept_local = 0
net.ipv4.conf.sit0.accept_redirects = 1
net.ipv4.conf.sit0.accept_source_route = 0
net.ipv4.conf.sit0.arp_accept = 0
net.ipv4.conf.sit0.arp_announce = 0
net.ipv4.conf.sit0.arp_evict_nocarrier = 1
net.ipv4.conf.sit0.arp_filter = 0
net.ipv4.conf.sit0.arp_ignore = 0
net.ipv4.conf.sit0.arp_notify = 0
net.ipv4.conf.sit0.bc_forwarding = 0
net.ipv4.conf.sit0.bootp_relay = 0
net.ipv4.conf.sit0.disable_policy = 0
net.ipv4.conf.sit0.disable_xfrm = 0
net.ipv4.conf.sit0.drop_gratuitous_arp = 0
net.ipv4.conf.sit0.drop_unicast_in_l2_multicast = 0
net.ipv4.conf.sit0.force_igmp_version = 0
net.ipv4.conf.sit0.forwarding = 0
net.ipv4.conf.sit0.igmpv2_unsolicited_report_interval = 10000
net.ipv4.conf.sit0.igmpv3_unsolicited_report_interval = 1000
net.ipv4.conf.sit0.ignore_routes_with_linkdown = 0
net.ipv4.conf.sit0.log_martians = 0
net.ipv4.conf.sit0.mc_forwarding = 0
net.ipv4.conf.sit0.medium_id = 0
net.ipv4.conf.sit0.promote_secondaries = 1
net.ipv4.conf.sit0.proxy_arp = 0
net.ipv4.conf.sit0.proxy_arp_pvlan = 0
net.ipv4.conf.sit0.route_localnet = 0
net.ipv4.conf.sit0.rp_filter = 2
net.ipv4.conf.sit0.secure_redirects = 1
net.ipv4.conf.sit0.send_redirects = 1
net.ipv4.conf.sit0.shared_media = 1
net.ipv4.conf.sit0.src_valid_mark = 0
net.ipv4.conf.sit0.tag = 0
net.ipv4.fib_notify_on_flag_change = 0
net.ipv4.fib_sync_mem = 524288
net.ipv4.fwmark_reflect = 0
net.ipv4.icmp_echo_enable_probe = 0
net.ipv4.icmp_echo_ignore_all = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_errors_use_inbound_ifaddr = 0
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.icmp_msgs_burst = 50
net.ipv4.icmp_msgs_per_sec = 1000
net.ipv4.icmp_ratelimit = 1000
net.ipv4.icmp_ratemask = 6168
net.ipv4.igmp_link_local_mcast_reports = 1
net.ipv4.igmp_max_memberships = 20
net.ipv4.igmp_max_msf = 10
net.ipv4.inet_peer_maxttl = 600
net.ipv4.inet_peer_minttl = 120
net.ipv4.inet_peer_threshold = 9212
net.ipv4.ip_autobind_reuse = 0
net.ipv4.ip_default_ttl = 64
net.ipv4.ip_dynaddr = 0
net.ipv4.ip_early_demux = 1
net.ipv4.ip_forward = 0
net.ipv4.ip_forward_update_priority = 1
net.ipv4.ip_forward_use_pmtu = 0
net.ipv4.ip_local_port_range = 32768 60999
net.ipv4.ip_local_reserved_ports =
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.ip_nonlocal_bind = 0
net.ipv4.ip_unprivileged_port_start = 1024
net.ipv4.ipfrag_high_thresh = 4194304
net.ipv4.ipfrag_low_thresh = 3145728
net.ipv4.ipfrag_max_dist = 64
net.ipv4.ipfrag_secret_interval = 0
net.ipv4.ipfrag_time = 30
net.ipv4.neigh.default.anycast_delay = 100
net.ipv4.neigh.default.app_solicit = 0
net.ipv4.neigh.default.base_reachable_time_ms = 30000
net.ipv4.neigh.default.delay_first_probe_time = 5
net.ipv4.neigh.default.gc_interval = 30
net.ipv4.neigh.default.gc_stale_time = 60
net.ipv4.neigh.default.gc_thresh1 = 128
net.ipv4.neigh.default.gc_thresh2 = 512
net.ipv4.neigh.default.gc_thresh3 = 1024
net.ipv4.neigh.default.interval_probe_time_ms = 5000
net.ipv4.neigh.default.locktime = 100
net.ipv4.neigh.default.mcast_resolicit = 0
net.ipv4.neigh.default.mcast_solicit = 3
net.ipv4.neigh.default.proxy_delay = 80
net.ipv4.neigh.default.proxy_qlen = 64
net.ipv4.neigh.default.retrans_time_ms = 1000
net.ipv4.neigh.default.ucast_solicit = 3
net.ipv4.neigh.default.unres_qlen = 91
net.ipv4.neigh.default.unres_qlen_bytes = 180224
net.ipv4.neigh.enx3495db26e312.anycast_delay = 100
net.ipv4.neigh.enx3495db26e312.app_solicit = 0
net.ipv4.neigh.enx3495db26e312.base_reachable_time_ms = 30000
net.ipv4.neigh.enx3495db26e312.delay_first_probe_time = 5
net.ipv4.neigh.enx3495db26e312.gc_stale_time = 60
net.ipv4.neigh.enx3495db26e312.interval_probe_time_ms = 5000
net.ipv4.neigh.enx3495db26e312.locktime = 100
net.ipv4.neigh.enx3495db26e312.mcast_resolicit = 0
net.ipv4.neigh.enx3495db26e312.mcast_solicit = 3
net.ipv4.neigh.enx3495db26e312.proxy_delay = 80
net.ipv4.neigh.enx3495db26e312.proxy_qlen = 64
net.ipv4.neigh.enx3495db26e312.retrans_time_ms = 1000
net.ipv4.neigh.enx3495db26e312.ucast_solicit = 3
net.ipv4.neigh.enx3495db26e312.unres_qlen = 91
net.ipv4.neigh.enx3495db26e312.unres_qlen_bytes = 180224
net.ipv4.neigh.lo.anycast_delay = 100
net.ipv4.neigh.lo.app_solicit = 0
net.ipv4.neigh.lo.base_reachable_time_ms = 30000
net.ipv4.neigh.lo.delay_first_probe_time = 5
net.ipv4.neigh.lo.gc_stale_time = 60
net.ipv4.neigh.lo.interval_probe_time_ms = 5000
net.ipv4.neigh.lo.locktime = 100
net.ipv4.neigh.lo.mcast_resolicit = 0
net.ipv4.neigh.lo.mcast_solicit = 3
net.ipv4.neigh.lo.proxy_delay = 80
net.ipv4.neigh.lo.proxy_qlen = 64
net.ipv4.neigh.lo.retrans_time_ms = 1000
net.ipv4.neigh.lo.ucast_solicit = 3
net.ipv4.neigh.lo.unres_qlen = 91
net.ipv4.neigh.lo.unres_qlen_bytes = 180224
net.ipv4.neigh.sit0.anycast_delay = 100
net.ipv4.neigh.sit0.app_solicit = 0
net.ipv4.neigh.sit0.base_reachable_time_ms = 30000
net.ipv4.neigh.sit0.delay_first_probe_time = 5
net.ipv4.neigh.sit0.gc_stale_time = 60
net.ipv4.neigh.sit0.interval_probe_time_ms = 5000
net.ipv4.neigh.sit0.locktime = 100
net.ipv4.neigh.sit0.mcast_resolicit = 0
net.ipv4.neigh.sit0.mcast_solicit = 3
net.ipv4.neigh.sit0.proxy_delay = 80
net.ipv4.neigh.sit0.proxy_qlen = 64
net.ipv4.neigh.sit0.retrans_time_ms = 1000
net.ipv4.neigh.sit0.ucast_solicit = 3
net.ipv4.neigh.sit0.unres_qlen = 91
net.ipv4.neigh.sit0.unres_qlen_bytes = 180224
net.ipv4.nexthop_compat_mode = 1
net.ipv4.ping_group_range = 0 2147483647
net.ipv4.route.error_burst = 500
net.ipv4.route.error_cost = 100
net.ipv4.route.gc_elasticity = 8
net.ipv4.route.gc_interval = 60
net.ipv4.route.gc_min_interval = 0
net.ipv4.route.gc_min_interval_ms = 500
net.ipv4.route.gc_thresh = -1
net.ipv4.route.gc_timeout = 300
net.ipv4.route.max_size = 2147483647
net.ipv4.route.min_adv_mss = 256
net.ipv4.route.min_pmtu = 552
net.ipv4.route.mtu_expires = 600
net.ipv4.route.redirect_load = 2
net.ipv4.route.redirect_number = 9
net.ipv4.route.redirect_silence = 2048
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_adv_win_scale = 1
net.ipv4.tcp_allowed_congestion_control = reno cubic
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_autocorking = 1
net.ipv4.tcp_available_congestion_control = reno cubic
net.ipv4.tcp_available_ulp =
net.ipv4.tcp_base_mss = 1024
net.ipv4.tcp_challenge_ack_limit = 2147483647
net.ipv4.tcp_child_ehash_entries = 0
net.ipv4.tcp_comp_sack_delay_ns = 1000000
net.ipv4.tcp_comp_sack_nr = 44
net.ipv4.tcp_comp_sack_slack_ns = 100000
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_early_demux = 1
net.ipv4.tcp_early_retrans = 3
net.ipv4.tcp_ecn = 2
net.ipv4.tcp_ecn_fallback = 1
net.ipv4.tcp_ehash_entries = 1024
net.ipv4.tcp_fack = 0
net.ipv4.tcp_fastopen = 1
net.ipv4.tcp_fastopen_blackhole_timeout_sec = 0
net.ipv4.tcp_fastopen_key = 00000000-00000000-00000000-00000000
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_frto = 2
net.ipv4.tcp_fwmark_accept = 0
net.ipv4.tcp_invalid_ratelimit = 500
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_limit_output_bytes = 1048576
net.ipv4.tcp_low_latency = 0
net.ipv4.tcp_max_orphans = 512
net.ipv4.tcp_max_reordering = 300
net.ipv4.tcp_max_syn_backlog = 128
net.ipv4.tcp_max_tw_buckets = 512
net.ipv4.tcp_mem = 1323 1767 2646
net.ipv4.tcp_migrate_req = 0
net.ipv4.tcp_min_rtt_wlen = 300
net.ipv4.tcp_min_snd_mss = 48
net.ipv4.tcp_min_tso_segs = 2
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_mtu_probe_floor = 48
net.ipv4.tcp_mtu_probing = 0
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_no_ssthresh_metrics_save = 1
net.ipv4.tcp_notsent_lowat = 4294967295
net.ipv4.tcp_orphan_retries = 0
net.ipv4.tcp_pacing_ca_ratio = 120
net.ipv4.tcp_pacing_ss_ratio = 200
net.ipv4.tcp_probe_interval = 600
net.ipv4.tcp_probe_threshold = 8
net.ipv4.tcp_recovery = 1
net.ipv4.tcp_reflect_tos = 0
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_rmem = 4096 131072 904992
net.ipv4.tcp_sack = 1
net.ipv4.tcp_shrink_window = 0
net.ipv4.tcp_slow_start_after_idle = 1
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_syn_retries = 6
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_thin_linear_timeouts = 0
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tso_rtt_log = 9
net.ipv4.tcp_tso_win_divisor = 3
net.ipv4.tcp_tw_reuse = 2
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_wmem = 4096 16384 904992
net.ipv4.tcp_workaround_signed_windows = 0
net.ipv4.udp_early_demux = 1
net.ipv4.udp_mem = 2649 3535 5298
net.ipv4.udp_rmem_min = 4096
net.ipv4.udp_wmem_min = 4096
net.ipv6.anycast_src_echo_reply = 0
net.ipv6.auto_flowlabels = 1
net.ipv6.bindv6only = 0
net.ipv6.conf.all.accept_dad = 0
net.ipv6.conf.all.accept_ra = 1
net.ipv6.conf.all.accept_ra_defrtr = 1
net.ipv6.conf.all.accept_ra_from_local = 0
net.ipv6.conf.all.accept_ra_min_hop_limit = 1
net.ipv6.conf.all.accept_ra_min_lft = 0
net.ipv6.conf.all.accept_ra_mtu = 1
net.ipv6.conf.all.accept_ra_pinfo = 1
net.ipv6.conf.all.accept_redirects = 1
net.ipv6.conf.all.accept_source_route = 0
net.ipv6.conf.all.accept_untracked_na = 0
net.ipv6.conf.all.addr_gen_mode = 0
net.ipv6.conf.all.autoconf = 1
net.ipv6.conf.all.dad_transmits = 1
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.all.disable_policy = 0
net.ipv6.conf.all.drop_unicast_in_l2_multicast = 0
net.ipv6.conf.all.drop_unsolicited_na = 0
net.ipv6.conf.all.enhanced_dad = 1
net.ipv6.conf.all.force_mld_version = 0
net.ipv6.conf.all.force_tllao = 0
net.ipv6.conf.all.forwarding = 0
net.ipv6.conf.all.hop_limit = 64
net.ipv6.conf.all.ignore_routes_with_linkdown = 0
net.ipv6.conf.all.ioam6_enabled = 0
net.ipv6.conf.all.ioam6_id = 65535
net.ipv6.conf.all.ioam6_id_wide = 4294967295
net.ipv6.conf.all.keep_addr_on_down = 0
net.ipv6.conf.all.max_addresses = 16
net.ipv6.conf.all.max_desync_factor = 600
net.ipv6.conf.all.mldv1_unsolicited_report_interval = 10000
net.ipv6.conf.all.mldv2_unsolicited_report_interval = 1000
net.ipv6.conf.all.mtu = 1280
net.ipv6.conf.all.ndisc_evict_nocarrier = 1
net.ipv6.conf.all.ndisc_notify = 0
net.ipv6.conf.all.ndisc_tclass = 0
net.ipv6.conf.all.proxy_ndp = 0
net.ipv6.conf.all.ra_defrtr_metric = 1024
net.ipv6.conf.all.regen_max_retry = 3
net.ipv6.conf.all.router_solicitation_delay = 1
net.ipv6.conf.all.router_solicitation_interval = 4
net.ipv6.conf.all.router_solicitation_max_interval = 3600
net.ipv6.conf.all.router_solicitations = -1
net.ipv6.conf.all.rpl_seg_enabled = 0
net.ipv6.conf.all.seg6_enabled = 0
net.ipv6.conf.all.suppress_frag_ndisc = 1
net.ipv6.conf.all.temp_prefered_lft = 86400
net.ipv6.conf.all.temp_valid_lft = 604800
net.ipv6.conf.all.use_oif_addrs_only = 0
net.ipv6.conf.all.use_tempaddr = 0
net.ipv6.conf.default.accept_dad = 1
net.ipv6.conf.default.accept_ra = 1
net.ipv6.conf.default.accept_ra_defrtr = 1
net.ipv6.conf.default.accept_ra_from_local = 0
net.ipv6.conf.default.accept_ra_min_hop_limit = 1
net.ipv6.conf.default.accept_ra_min_lft = 0
net.ipv6.conf.default.accept_ra_mtu = 1
net.ipv6.conf.default.accept_ra_pinfo = 1
net.ipv6.conf.default.accept_redirects = 1
net.ipv6.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_untracked_na = 0
net.ipv6.conf.default.addr_gen_mode = 0
net.ipv6.conf.default.autoconf = 1
net.ipv6.conf.default.dad_transmits = 1
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.default.disable_policy = 0
net.ipv6.conf.default.drop_unicast_in_l2_multicast = 0
net.ipv6.conf.default.drop_unsolicited_na = 0
net.ipv6.conf.default.enhanced_dad = 1
net.ipv6.conf.default.force_mld_version = 0
net.ipv6.conf.default.force_tllao = 0
net.ipv6.conf.default.forwarding = 0
net.ipv6.conf.default.hop_limit = 64
net.ipv6.conf.default.ignore_routes_with_linkdown = 0
net.ipv6.conf.default.ioam6_enabled = 0
net.ipv6.conf.default.ioam6_id = 65535
net.ipv6.conf.default.ioam6_id_wide = 4294967295
net.ipv6.conf.default.keep_addr_on_down = 0
net.ipv6.conf.default.max_addresses = 16
net.ipv6.conf.default.max_desync_factor = 600
net.ipv6.conf.default.mldv1_unsolicited_report_interval = 10000
net.ipv6.conf.default.mldv2_unsolicited_report_interval = 1000
net.ipv6.conf.default.mtu = 1280
net.ipv6.conf.default.ndisc_evict_nocarrier = 1
net.ipv6.conf.default.ndisc_notify = 0
net.ipv6.conf.default.ndisc_tclass = 0
net.ipv6.conf.default.proxy_ndp = 0
net.ipv6.conf.default.ra_defrtr_metric = 1024
net.ipv6.conf.default.regen_max_retry = 3
net.ipv6.conf.default.router_solicitation_delay = 1
net.ipv6.conf.default.router_solicitation_interval = 4
net.ipv6.conf.default.router_solicitation_max_interval = 3600
net.ipv6.conf.default.router_solicitations = -1
net.ipv6.conf.default.rpl_seg_enabled = 0
net.ipv6.conf.default.seg6_enabled = 0
net.ipv6.conf.default.suppress_frag_ndisc = 1
net.ipv6.conf.default.temp_prefered_lft = 86400
net.ipv6.conf.default.temp_valid_lft = 604800
net.ipv6.conf.default.use_oif_addrs_only = 0
net.ipv6.conf.default.use_tempaddr = 0
net.ipv6.conf.enx3495db26e312.accept_dad = 1
net.ipv6.conf.enx3495db26e312.accept_ra = 0
net.ipv6.conf.enx3495db26e312.accept_ra_defrtr = 1
net.ipv6.conf.enx3495db26e312.accept_ra_from_local = 0
net.ipv6.conf.enx3495db26e312.accept_ra_min_hop_limit = 1
net.ipv6.conf.enx3495db26e312.accept_ra_min_lft = 0
net.ipv6.conf.enx3495db26e312.accept_ra_mtu = 1
net.ipv6.conf.enx3495db26e312.accept_ra_pinfo = 1
net.ipv6.conf.enx3495db26e312.accept_redirects = 1
net.ipv6.conf.enx3495db26e312.accept_source_route = 0
net.ipv6.conf.enx3495db26e312.accept_untracked_na = 0
net.ipv6.conf.enx3495db26e312.addr_gen_mode = 0
net.ipv6.conf.enx3495db26e312.autoconf = 1
net.ipv6.conf.enx3495db26e312.dad_transmits = 1
net.ipv6.conf.enx3495db26e312.disable_ipv6 = 0
net.ipv6.conf.enx3495db26e312.disable_policy = 0
net.ipv6.conf.enx3495db26e312.drop_unicast_in_l2_multicast = 0
net.ipv6.conf.enx3495db26e312.drop_unsolicited_na = 0
net.ipv6.conf.enx3495db26e312.enhanced_dad = 1
net.ipv6.conf.enx3495db26e312.force_mld_version = 0
net.ipv6.conf.enx3495db26e312.force_tllao = 0
net.ipv6.conf.enx3495db26e312.forwarding = 0
net.ipv6.conf.enx3495db26e312.hop_limit = 64
net.ipv6.conf.enx3495db26e312.ignore_routes_with_linkdown = 0
net.ipv6.conf.enx3495db26e312.ioam6_enabled = 0
net.ipv6.conf.enx3495db26e312.ioam6_id = 65535
net.ipv6.conf.enx3495db26e312.ioam6_id_wide = 4294967295
net.ipv6.conf.enx3495db26e312.keep_addr_on_down = 0
net.ipv6.conf.enx3495db26e312.max_addresses = 16
net.ipv6.conf.enx3495db26e312.max_desync_factor = 600
net.ipv6.conf.enx3495db26e312.mldv1_unsolicited_report_interval = 10000
net.ipv6.conf.enx3495db26e312.mldv2_unsolicited_report_interval = 1000
net.ipv6.conf.enx3495db26e312.mtu = 1500
net.ipv6.conf.enx3495db26e312.ndisc_evict_nocarrier = 1
net.ipv6.conf.enx3495db26e312.ndisc_notify = 0
net.ipv6.conf.enx3495db26e312.ndisc_tclass = 0
net.ipv6.conf.enx3495db26e312.proxy_ndp = 0
net.ipv6.conf.enx3495db26e312.ra_defrtr_metric = 1024
net.ipv6.conf.enx3495db26e312.regen_max_retry = 3
net.ipv6.conf.enx3495db26e312.router_solicitation_delay = 1
net.ipv6.conf.enx3495db26e312.router_solicitation_interval = 4
net.ipv6.conf.enx3495db26e312.router_solicitation_max_interval = 3600
net.ipv6.conf.enx3495db26e312.router_solicitations = -1
net.ipv6.conf.enx3495db26e312.rpl_seg_enabled = 0
net.ipv6.conf.enx3495db26e312.seg6_enabled = 0
net.ipv6.conf.enx3495db26e312.suppress_frag_ndisc = 1
net.ipv6.conf.enx3495db26e312.temp_prefered_lft = 86400
net.ipv6.conf.enx3495db26e312.temp_valid_lft = 604800
net.ipv6.conf.enx3495db26e312.use_oif_addrs_only = 0
net.ipv6.conf.enx3495db26e312.use_tempaddr = 0
net.ipv6.conf.lo.accept_dad = -1
net.ipv6.conf.lo.accept_ra = 1
net.ipv6.conf.lo.accept_ra_defrtr = 1
net.ipv6.conf.lo.accept_ra_from_local = 0
net.ipv6.conf.lo.accept_ra_min_hop_limit = 1
net.ipv6.conf.lo.accept_ra_min_lft = 0
net.ipv6.conf.lo.accept_ra_mtu = 1
net.ipv6.conf.lo.accept_ra_pinfo = 1
net.ipv6.conf.lo.accept_redirects = 1
net.ipv6.conf.lo.accept_source_route = 0
net.ipv6.conf.lo.accept_untracked_na = 0
net.ipv6.conf.lo.addr_gen_mode = 0
net.ipv6.conf.lo.autoconf = 1
net.ipv6.conf.lo.dad_transmits = 1
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.lo.disable_policy = 0
net.ipv6.conf.lo.drop_unicast_in_l2_multicast = 0
net.ipv6.conf.lo.drop_unsolicited_na = 0
net.ipv6.conf.lo.enhanced_dad = 1
net.ipv6.conf.lo.force_mld_version = 0
net.ipv6.conf.lo.force_tllao = 0
net.ipv6.conf.lo.forwarding = 0
net.ipv6.conf.lo.hop_limit = 64
net.ipv6.conf.lo.ignore_routes_with_linkdown = 0
net.ipv6.conf.lo.ioam6_enabled = 0
net.ipv6.conf.lo.ioam6_id = 65535
net.ipv6.conf.lo.ioam6_id_wide = 4294967295
net.ipv6.conf.lo.keep_addr_on_down = 0
net.ipv6.conf.lo.max_addresses = 16
net.ipv6.conf.lo.max_desync_factor = 600
net.ipv6.conf.lo.mldv1_unsolicited_report_interval = 10000
net.ipv6.conf.lo.mldv2_unsolicited_report_interval = 1000
net.ipv6.conf.lo.mtu = 65536
net.ipv6.conf.lo.ndisc_evict_nocarrier = 1
net.ipv6.conf.lo.ndisc_notify = 0
net.ipv6.conf.lo.ndisc_tclass = 0
net.ipv6.conf.lo.proxy_ndp = 0
net.ipv6.conf.lo.ra_defrtr_metric = 1024
net.ipv6.conf.lo.regen_max_retry = 3
net.ipv6.conf.lo.router_solicitation_delay = 1
net.ipv6.conf.lo.router_solicitation_interval = 4
net.ipv6.conf.lo.router_solicitation_max_interval = 3600
net.ipv6.conf.lo.router_solicitations = -1
net.ipv6.conf.lo.rpl_seg_enabled = 0
net.ipv6.conf.lo.seg6_enabled = 0
net.ipv6.conf.lo.suppress_frag_ndisc = 1
net.ipv6.conf.lo.temp_prefered_lft = 86400
net.ipv6.conf.lo.temp_valid_lft = 604800
net.ipv6.conf.lo.use_oif_addrs_only = 0
net.ipv6.conf.lo.use_tempaddr = -1
net.ipv6.conf.sit0.accept_dad = -1
net.ipv6.conf.sit0.accept_ra = 1
net.ipv6.conf.sit0.accept_ra_defrtr = 1
net.ipv6.conf.sit0.accept_ra_from_local = 0
net.ipv6.conf.sit0.accept_ra_min_hop_limit = 1
net.ipv6.conf.sit0.accept_ra_min_lft = 0
net.ipv6.conf.sit0.accept_ra_mtu = 1
net.ipv6.conf.sit0.accept_ra_pinfo = 1
net.ipv6.conf.sit0.accept_redirects = 1
net.ipv6.conf.sit0.accept_source_route = 0
net.ipv6.conf.sit0.accept_untracked_na = 0
net.ipv6.conf.sit0.addr_gen_mode = 0
net.ipv6.conf.sit0.autoconf = 1
net.ipv6.conf.sit0.dad_transmits = 1
net.ipv6.conf.sit0.disable_ipv6 = 0
net.ipv6.conf.sit0.disable_policy = 0
net.ipv6.conf.sit0.drop_unicast_in_l2_multicast = 0
net.ipv6.conf.sit0.drop_unsolicited_na = 0
net.ipv6.conf.sit0.enhanced_dad = 1
net.ipv6.conf.sit0.force_mld_version = 0
net.ipv6.conf.sit0.force_tllao = 0
net.ipv6.conf.sit0.forwarding = 0
net.ipv6.conf.sit0.hop_limit = 64
net.ipv6.conf.sit0.ignore_routes_with_linkdown = 0
net.ipv6.conf.sit0.ioam6_enabled = 0
net.ipv6.conf.sit0.ioam6_id = 65535
net.ipv6.conf.sit0.ioam6_id_wide = 4294967295
net.ipv6.conf.sit0.keep_addr_on_down = 0
net.ipv6.conf.sit0.max_addresses = 16
net.ipv6.conf.sit0.max_desync_factor = 600
net.ipv6.conf.sit0.mldv1_unsolicited_report_interval = 10000
net.ipv6.conf.sit0.mldv2_unsolicited_report_interval = 1000
net.ipv6.conf.sit0.mtu = 1480
net.ipv6.conf.sit0.ndisc_evict_nocarrier = 1
net.ipv6.conf.sit0.ndisc_notify = 0
net.ipv6.conf.sit0.ndisc_tclass = 0
net.ipv6.conf.sit0.proxy_ndp = 0
net.ipv6.conf.sit0.ra_defrtr_metric = 1024
net.ipv6.conf.sit0.regen_max_retry = 3
net.ipv6.conf.sit0.router_solicitation_delay = 1
net.ipv6.conf.sit0.router_solicitation_interval = 4
net.ipv6.conf.sit0.router_solicitation_max_interval = 3600
net.ipv6.conf.sit0.router_solicitations = -1
net.ipv6.conf.sit0.rpl_seg_enabled = 0
net.ipv6.conf.sit0.seg6_enabled = 0
net.ipv6.conf.sit0.suppress_frag_ndisc = 1
net.ipv6.conf.sit0.temp_prefered_lft = 86400
net.ipv6.conf.sit0.temp_valid_lft = 604800
net.ipv6.conf.sit0.use_oif_addrs_only = 0
net.ipv6.conf.sit0.use_tempaddr = -1
net.ipv6.fib_multipath_hash_fields = 7
net.ipv6.fib_multipath_hash_policy = 0
net.ipv6.fib_notify_on_flag_change = 0
net.ipv6.flowlabel_consistency = 1
net.ipv6.flowlabel_reflect = 0
net.ipv6.flowlabel_state_ranges = 0
net.ipv6.fwmark_reflect = 0
net.ipv6.icmp.echo_ignore_all = 0
net.ipv6.icmp.echo_ignore_anycast = 0
net.ipv6.icmp.echo_ignore_multicast = 0
net.ipv6.icmp.ratelimit = 1000
net.ipv6.icmp.ratemask = 0-1,3-127
net.ipv6.idgen_delay = 1
net.ipv6.idgen_retries = 3
net.ipv6.ioam6_id = 16777215
net.ipv6.ioam6_id_wide = 4294967295 16777215
net.ipv6.ip6frag_high_thresh = 4194304
net.ipv6.ip6frag_low_thresh = 3145728
net.ipv6.ip6frag_secret_interval = 0
net.ipv6.ip6frag_time = 60
net.ipv6.ip_nonlocal_bind = 0
net.ipv6.max_dst_opts_length = 2147483647
net.ipv6.max_dst_opts_number = 8
net.ipv6.max_hbh_length = 2147483647
net.ipv6.max_hbh_opts_number = 8
net.ipv6.mld_max_msf = 64
net.ipv6.mld_qrv = 2
net.ipv6.neigh.default.anycast_delay = 100
net.ipv6.neigh.default.app_solicit = 0
net.ipv6.neigh.default.base_reachable_time_ms = 30000
net.ipv6.neigh.default.delay_first_probe_time = 5
net.ipv6.neigh.default.gc_interval = 30
net.ipv6.neigh.default.gc_stale_time = 60
net.ipv6.neigh.default.gc_thresh1 = 128
net.ipv6.neigh.default.gc_thresh2 = 512
net.ipv6.neigh.default.gc_thresh3 = 1024
net.ipv6.neigh.default.interval_probe_time_ms = 5000
net.ipv6.neigh.default.locktime = 0
net.ipv6.neigh.default.mcast_resolicit = 0
net.ipv6.neigh.default.mcast_solicit = 3
net.ipv6.neigh.default.proxy_delay = 80
net.ipv6.neigh.default.proxy_qlen = 64
net.ipv6.neigh.default.retrans_time_ms = 1000
net.ipv6.neigh.default.ucast_solicit = 3
net.ipv6.neigh.default.unres_qlen = 91
net.ipv6.neigh.default.unres_qlen_bytes = 180224
net.ipv6.neigh.enx3495db26e312.anycast_delay = 100
net.ipv6.neigh.enx3495db26e312.app_solicit = 0
net.ipv6.neigh.enx3495db26e312.base_reachable_time_ms = 30000
net.ipv6.neigh.enx3495db26e312.delay_first_probe_time = 5
net.ipv6.neigh.enx3495db26e312.gc_stale_time = 60
net.ipv6.neigh.enx3495db26e312.interval_probe_time_ms = 5000
net.ipv6.neigh.enx3495db26e312.locktime = 0
net.ipv6.neigh.enx3495db26e312.mcast_resolicit = 0
net.ipv6.neigh.enx3495db26e312.mcast_solicit = 3
net.ipv6.neigh.enx3495db26e312.proxy_delay = 80
net.ipv6.neigh.enx3495db26e312.proxy_qlen = 64
net.ipv6.neigh.enx3495db26e312.retrans_time_ms = 1000
net.ipv6.neigh.enx3495db26e312.ucast_solicit = 3
net.ipv6.neigh.enx3495db26e312.unres_qlen = 91
net.ipv6.neigh.enx3495db26e312.unres_qlen_bytes = 180224
net.ipv6.neigh.lo.anycast_delay = 100
net.ipv6.neigh.lo.app_solicit = 0
net.ipv6.neigh.lo.base_reachable_time_ms = 30000
net.ipv6.neigh.lo.delay_first_probe_time = 5
net.ipv6.neigh.lo.gc_stale_time = 60
net.ipv6.neigh.lo.interval_probe_time_ms = 5000
net.ipv6.neigh.lo.locktime = 0
net.ipv6.neigh.lo.mcast_resolicit = 0
net.ipv6.neigh.lo.mcast_solicit = 3
net.ipv6.neigh.lo.proxy_delay = 80
net.ipv6.neigh.lo.proxy_qlen = 64
net.ipv6.neigh.lo.retrans_time_ms = 1000
net.ipv6.neigh.lo.ucast_solicit = 3
net.ipv6.neigh.lo.unres_qlen = 91
net.ipv6.neigh.lo.unres_qlen_bytes = 180224
net.ipv6.neigh.sit0.anycast_delay = 100
net.ipv6.neigh.sit0.app_solicit = 0
net.ipv6.neigh.sit0.base_reachable_time_ms = 30000
net.ipv6.neigh.sit0.delay_first_probe_time = 5
net.ipv6.neigh.sit0.gc_stale_time = 60
net.ipv6.neigh.sit0.interval_probe_time_ms = 5000
net.ipv6.neigh.sit0.locktime = 0
net.ipv6.neigh.sit0.mcast_resolicit = 0
net.ipv6.neigh.sit0.mcast_solicit = 3
net.ipv6.neigh.sit0.proxy_delay = 80
net.ipv6.neigh.sit0.proxy_qlen = 64
net.ipv6.neigh.sit0.retrans_time_ms = 1000
net.ipv6.neigh.sit0.ucast_solicit = 3
net.ipv6.neigh.sit0.unres_qlen = 91
net.ipv6.neigh.sit0.unres_qlen_bytes = 180224
net.ipv6.route.gc_elasticity = 9
net.ipv6.route.gc_interval = 30
net.ipv6.route.gc_min_interval = 0
net.ipv6.route.gc_min_interval_ms = 500
net.ipv6.route.gc_thresh = 1024
net.ipv6.route.gc_timeout = 60
net.ipv6.route.max_size = 4096
net.ipv6.route.min_adv_mss = 1220
net.ipv6.route.mtu_expires = 600
net.ipv6.route.skip_notify_on_dev_down = 0
net.ipv6.seg6_flowlabel = 0
net.unix.max_dgram_qlen = 512
sunrpc.max_resvport = 1023
sunrpc.min_resvport = 665
sunrpc.tcp_fin_timeout = 15
sunrpc.tcp_max_slot_table_entries = 65536
sunrpc.tcp_slot_table_entries = 2
sunrpc.udp_slot_table_entries = 16
user.max_cgroup_namespaces = 899
user.max_inotify_instances = 128
user.max_inotify_watches = 8192
user.max_ipc_namespaces = 899
user.max_mnt_namespaces = 899
user.max_net_namespaces = 899
user.max_pid_namespaces = 899
user.max_time_namespaces = 899
user.max_user_namespaces = 899
user.max_uts_namespaces = 899
vm.admin_reserve_kbytes = 3547
vm.compact_unevictable_allowed = 1
vm.compaction_proactiveness = 20
vm.dirty_background_bytes = 0
vm.dirty_background_ratio = 10
vm.dirty_bytes = 0
vm.dirty_expire_centisecs = 3000
vm.dirty_ratio = 20
vm.dirty_writeback_centisecs = 500
vm.dirtytime_expire_seconds = 43200
vm.extfrag_threshold = 500
vm.laptop_mode = 0
vm.legacy_va_layout = 0
vm.lowmem_reserve_ratio = 32 0
vm.max_map_count = 1048576
vm.min_free_kbytes = 1357
vm.mmap_min_addr = 4096
vm.mmap_rnd_bits = 8
vm.oom_dump_tasks = 1
vm.oom_kill_allocating_task = 0
vm.overcommit_kbytes = 0
vm.overcommit_memory = 0
vm.overcommit_ratio = 50
vm.page-cluster = 3
vm.page_lock_unfairness = 5
vm.panic_on_oom = 0
vm.percpu_pagelist_high_fraction = 0
vm.swappiness = 60
vm.user_reserve_kbytes = 3547
vm.vfs_cache_pressure = 100
vm.watermark_boost_factor = 15000
vm.watermark_scale_factor = 10
user@brain:~$
sysctl.conf 最適化項目の解説カテゴリ パラメータ 設定値 設定変更の狙い メモリ vm.swappiness0SDカードへのスワップを極限まで禁止。 メモリ vm.vfs_cache_pressure50ゲームの読み込みを高速化。 I/O vm.dirty_ratio5SDカードの「プチフリ」防止（第1弾）。 I/O vm.dirty_background_ratio2SDカードの「プチフリ」防止（第2弾）。 I/O vm.dirty_expire_centisecs1000書き込み猶予の短縮。 I/O vm.dirty_writeback_centisecs300書き込みプロセスの頻繁な起動。 CPU kernel.sched_child_runs_first0親プロセスのカクつき防止。 ネット net.ipv4.tcp_rmem4096 87380 131072受信バッファの制限。 ネットワーク受信に使うメモリ上限を最大128KBに制限し、貴重な物理RAMの浪費を徹底的に抑えます。ネット net.ipv4.tcp_wmem4096 65536 131072送信バッファの制限。 ネットワーク送信に使うメモリ上限を最大128KBに制限し、上記同様にメモリを節約します。ネット net.ipv4.tcp_fin_timeout15切断待ちの高速化。 通信が切断された後の無駄な待ち時間を15秒に短縮し、通信用のソケットリソースを素早く解放するようにします。ネット net.ipv4.tcp_tw_reuse1ソケットの再利用。 TIME_WAIT 状態にある古いソケットを新しい通信で即座に使い回し、カーネルのメモリ消費と管理負荷を減らします。カーネル kernel.printk3 3 3 3ログ出力によるCPU負荷の軽減。 画面（コンソール）やバックグラウンドへのシステムログ出力レベルを制限し、ゲームプレイ中などにログ書き込みの負荷でガタつくのを防きます。カーネル vm.oom_kill_allocating_task1完全フリーズの回避。 万が一ZRAMも1GBスワップも限界に達した際、カーネルが「どのプロセスを殺すか」を重い処理で探索するのをやめ、「今メモリを要求したタスク」を即座に強制終了（Kill）してシステム全体のハングアップを防ぎます。カーネル vm.panic_on_oom0システム巻き込み防止。 メモリ枯渇（OOM）が発生しても、カーネルパニックを起こしてシステムを強制再起動・完全フリーズさせず、OS全体の生存を最優先させます。
ZSWAPの有効化
ZSWAPとは、Linuxカーネルに備わっている仮想メモリ圧縮機能の一つです。
通常、物理メモリが足りなくなると、スワップ領域が設定されていれば仮想メモリ帰庫で、
しかし、Brainuxの場合メモリ容量が128MBと小さいこともありますが、
カーネルパラメータ[vm.swappiness=0]にて、出来るだけスワップ領域を使わない設定にしていますが、アプリのビルド時などでどうしても使うメモリ量が増えることもあるので、
zswapの仕組みとメリット
メモリのデータを圧縮して保持
圧倒的な高速化
ストレージ（SSD）の寿命を延ばす
Linuxカーネルの確認
zswapには、Linuxカーネルビルド時に、モジュール組み込みが必要です。
$ zcat /proc/config.gz > ~/debian.connfig
$ zcat /proc/config.gz > ~/debian.connfig
$ grep "ZSWAP" ~/debian.connfig
CONFIG_ZSWAP=y
# CONFIG_ZSWAP_DEFAULT_ON is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_DEFLATE is not set
CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZO=y
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_842 is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZ4 is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZ4HC is not set
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD is not set
CONFIG_ZSWAP_COMPRESSOR_DEFAULT="lzo"
CONFIG_ZSWAP_ZPOOL_DEFAULT_ZBUD=y
# CONFIG_ZSWAP_ZPOOL_DEFAULT_Z3FOLD is not set
# CONFIG_ZSWAP_ZPOOL_DEFAULT_ZSMALLOC is not set
CONFIG_ZSWAP_ZPOOL_DEFAULT="zbud"
$
こちらを確認すると、以下のようになっていました。
とりあえずカーネル上はZSWAPは有効になっていることを確認できました。
手動での有効化
まずは、現状、swap領域が有効になっているかを確認します。
$ sudo swapon –show
$ sudo swapon --show
NAME TYPE SIZE USED PRIO
/swapfile file 1024M 65.3M -2スワップ領域として、1GBが割り当てされているのが確認できました。
SWAP領域の確保
現在のZSWAPの稼働状況を確認します。
$ cat /sys/module/zswap/parameters/enabled
NNなので、現状は無効です。（これがデフォルト）
これを一時的に有効化します。
$ echo Y | sudo tee /sys/module/zswap/parameters/enabled > /dev/null
ZSWAPの設定・稼働確認
SWAPの設定の確認は、コマンドで可能です。
#設定の確認
$ grep -r . /sys/module/zswap/parameters/
/sys/module/zswap/parameters/accept_threshold_percent:90
/sys/module/zswap/parameters/enabled:Y
/sys/module/zswap/parameters/max_pool_percent:20
/sys/module/zswap/parameters/zpool:zbud
/sys/module/zswap/parameters/same_filled_pages_enabled:Y
/sys/module/zswap/parameters/non_same_filled_pages_enabled:Y
/sys/module/zswap/parameters/compressor:lzozpool: zbud （1ページに2つまでしか詰め込めない、少し古い世代の管理方式）
SWAPの稼働状況は、以下のコマンドで可能です。
#ZSWAPの状況
Every 5.0s: grep -r . /sys/kernel/debug/zswap/ brain: Mon Nov 2 17:18:13 2026
/sys/kernel/debug/zswap/same_filled_pages:173
/sys/kernel/debug/zswap/stored_pages:7521
/sys/kernel/debug/zswap/pool_total_size:15581184
/sys/kernel/debug/zswap/duplicate_entry:0
/sys/kernel/debug/zswap/written_back_pages:0
/sys/kernel/debug/zswap/reject_compress_poor:75
/sys/kernel/debug/zswap/reject_kmemcache_fail:0
/sys/kernel/debug/zswap/reject_alloc_fail:0
/sys/kernel/debug/zswap/reject_reclaim_fail:0
/sys/kernel/debug/zswap/pool_limit_hit:0
zswap稼働ステータスの分析
メモリ節約の効果（大）
ディスクへの書き込み（ゼロ）
効率の悪いデータの拒否
同じ値で満たされたページ
動作させるアプリによっては、
自動起動の設定
動作に問題なければ、ZSWAPをOS起動時に自動的に有効にします。
$ systemctl is-enabled systemd-tmpfiles-setup.service
static/etc/tmpfiles.d/zswap.conf
cat << EOF | sudo tee /etc/tmpfiles.d/zswap.conf > /dev/null
# type path mode user group age argument
f /sys/module/zswap/parameters/max_pool_percent - - - -
w /sys/module/zswap/parameters/enabled - - - - Y
w /sys/module/zswap/parameters/max_pool_percent - - - - 20
w /sys/module/zswap/parameters/zpool - - - - zbud
EOF変更後、Brainuxを再起動して、
$ cat /sys/module/zswap/parameters/enabled
Y自動的にZSWAPが有効になりました。
一時的に無効にするには、
もし、自動起動も停止したいということであれば、
ビルド実践
試しにStella の -O3 -flto ビルドをしてみましたが、問題なくビルド出来ました。
ZSWAPの運用的にも問題ないようです。
#ZSWAPの状況
/sys/kernel/debug/zswap/same_filled_pages:52
/sys/kernel/debug/zswap/stored_pages:1316
/sys/kernel/debug/zswap/pool_total_size:2875392
/sys/kernel/debug/zswap/duplicate_entry:0
/sys/kernel/debug/zswap/written_back_pages:108
/sys/kernel/debug/zswap/reject_compress_poor:662
/sys/kernel/debug/zswap/reject_kmemcache_fail:0
/sys/kernel/debug/zswap/reject_alloc_fail:0
/sys/kernel/debug/zswap/reject_reclaim_fail:0
/sys/kernel/debug/zswap/pool_limit_hit:4024
ビルド完了後の統計分析
プール上限との激しい攻防
microSD（実スワップ）への最終書き出し
現在のクリーンアップ状態
X11のフレームバッファ設定
SDL2の性能調査中に、比較対象の中に
このShadowFBオプションは、
高性能なGPUを使っている場合は不要（または無効化すべき）ですが、画面表示が極端に重い古い環境や組み込み環境で汎用ドライバーを使っている場合は、有効にすることで表示が滑らかになる選択肢です。
Brainuxも通常は有効になっていますが、
/etc/X11/xorg.confに追加
Option "ShadowFB" "false"
sudo vi /etc/X11/xorg.conf
Section "Device"
Identifier "device"
Driver "fbdev"
Option "ShadowFB" "false"
EndSection
Section "Screen"
Identifier "screen"
Device "device"
EndSection
この変更を行った後で、
すると、以下のグラフィック系ベンチマークが上がりました
testsprite (SDL1.2のテストプログラム)
ShadowFB True 26
ShadowFB False 39 向上率 1.5
testsprite2 (SDL2のテストプログラム)
ShadowFB True 32
ShadowFB False 43 向上率 1.34倍
testdraw2 (SDL2のテストプログラム)
ShadowFB True 24
ShadowFB False 30 向上率 1.25倍
glxgears (OPENGL系グラフィックベンチメーク)
ShadowFB True 3
ShadowFB False 3 向上率 1.00倍(効果あり)
数値（おそらくFPS：1秒あたりのフレーム数）を見ると、
なお、OPENGL系のベンチはパフォーマンスは変わりませんでした。
なぜ Brainux で ShadowFB = False の方が速いのかの推測
この結果から推測してみました。
メインメモリ（RAM）とVRAMの「物理的な同一性」
PCなどの独立したグラフィックボードがある環境では「遅いVRAM」と「速いメインメモリ」が分かれているため、ShadowFB が有効に働きます。
CPU（ARM926EJ-S）の処理能力の限界
i.MX28のCPUは、2026年の基準から見ると非常に低クロック（約454MHz）かつシングルコアです。
glxgears がどちらも 3 FPS で変わらない理由
glxgears はOpenGL（3D）のテストですが、Brainuxにはハードウェア3Dアクセラレータがないため、すべてCPUで計算（ソフトウェアラスタライズ：Mesa/LLVMpipeなど）しています。
以上より、.MX28では共有メモリ構成のためShadowFBのコピーオーバーヘッドが支配的になっている可能性があります
SDL2とSDL 1.2の内部挙動の違い、およびBrainuxにおける影響
SDL2とSDL 1.2の内部挙動の違い、およびBrainuxにおける影響は以下の通りです。
SDL 1.2 と SDL2 の大きな違い
SDL 1.2 (古い仕様):
SDL2 (新しい仕様):
なぜSDL 1.2でも ShadowFB False が正解なのか？
SDL 1.2はもともと「CPUで処理してメモリに書く」という動きをします。
ShadowFB True の場合:
ShadowFB False の場合:
環境変数によるパフォーマンスチェック
SDLなどは、環境変数をチェックして動作を変更します。
例えば、X11上で、SDL1.2ベースのアプリを動かす場合には、
export SDL_VIDEO_X11_NODIRECTCOLOR=1環境変数 SDL_VIDEO_X11_NODIRECTCOLOR=1 は、SDL 1.2 が XWindow System（X11）環境で画面を描画する際、カラーマップ（色情報の管理方式）の自動作成を無効化し、システムのデフォルト設定を強制的に使わせるための設定です。
SDL 1.2 は古いライブラリであるため、画面を表示するときに「この画面は何色（何ビットカラー）で描画するか」を厳密に制御しようとします。
指定しない場合（通常動作）：
NODIRECTCOLOR=1 を指定した場合：
Brainux におけるメリット
無駄な色変換処理の削減（軽量化）
画面の「色化け」や「チラつき」の防止
この設定を変更しても、特に画面描画には問題ないように見えますので、
環境変数の自動設定
上記をふくめて、環境設定を調整しています。
~/.xprofile
#X11環境用環境変数
export SDL_VIDEODRIVER=x11
#export GALLIUM_DRIVER=llvmpipe
#export GALLIUM_DRIVER=""
#export SDL_VIDEO_GL_DRIVER=""
export vblank_mode=1
export SDL_NOMOUSE=0
#export SDL_RENDER_DRIVER=software
#export SDL_HINT_RENDER_DRIVER=software
export SDL_RENDER_VSYNC=1
#export LIBGL_ALWAYS_SOFTWARE=1
export LP_NUM_THREADS=1
export SDL_VIDEO_X11_NODIRECTCOLOR=1
export SDL_AUDIODRIVER=pulse
~/.profile
# すでに .xprofile 等で X11 用の変数が割り当てられている場合はスキップする
if [ "$MY_ENV_TYPE" != "X11" ]; then
if [ -n "$SSH_CLIENT" ] || [ -n "$SSH_TTY" ]; then
# ----------------------------------
# SSHリモートログイン環境
# ----------------------------------
export DISPLAY=:0
export SDL_VIDEODRIVER=x11
#export GALLIUM_DRIVER=llvmpipe
export SDL_RENDER_VSYNC=1
export vblank_mode=0
export LP_NUM_THREADS=1
export SDL_VIDEO_X11_NODIRECTCOLOR=1
export SDL_NOMOUSE=0
else
# ----------------------------------
# CUIコンソール（実機ログイン）環境
# ----------------------------------
export SDL_VIDEODRIVER=fbcon
#export GALLIUM_DRIVER=llvmpipe
export SDL_RENDER_VSYNC=1
export vblank_mode=0
export LP_NUM_THREADS=1
export SDL_NOMOUSE=1
fi
fi
export SDL_AUDIODRIVER=pulse参考：
export GALLIUM_DRIVER=”” 変わらない(29)export vblank_mode=0 1のほうが早い export SDL_RENDER_DRIVER=software 遅くなる(26) #export LIBGL_ALWAYS_SOFTWARE=1 遅くなる(28)
Views: 13
