虚拟云服务器 Linux TCP 参数调优，轻松跑万兆

本调参来自 VPS.Town Debian 13 Trixie 优化镜像，官方测试结果如下：

编辑这个文件

nano /etc/sysctl.d/00-opti-vt.conf

将下面内容完整复制到文件内

kernel.pid_max = 65535
kernel.panic = 1
kernel.sysrq = 1
kernel.core_pattern = core_%e
kernel.printk = 3 4 1 3
kernel.numa_balancing = 0
kernel.sched_autogroup_enabled = 0

vm.swappiness = 10
vm.dirty_ratio = 10
vm.dirty_background_ratio = 5
vm.panic_on_oom = 1
vm.overcommit_memory = 1
vm.min_free_kbytes = 90214

net.core.default_qdisc = fq
net.core.netdev_max_backlog = 2000
net.core.rmem_max = 14745600
net.core.wmem_max = 14745600
net.core.rmem_default = 87380
net.core.wmem_default = 65536
net.core.somaxconn = 883
net.core.optmem_max = 65536

net.ipv4.tcp_fastopen = 3
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_max_tw_buckets = 32768
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 0

net.ipv4.tcp_rmem = 8192 87380 14745600
net.ipv4.tcp_wmem = 8192 65536 14745600
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_congestion_control = bbr
net.ipv4.tcp_notsent_lowat = 4096
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_adv_win_scale = 4
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_no_metrics_save = 0

net.ipv4.tcp_max_syn_backlog = 3533
net.ipv4.tcp_max_orphans = 65536
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_syncookies = 1

net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.route.gc_timeout = 100
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.neigh.default.gc_thresh3 = 8192
net.ipv4.neigh.default.gc_thresh2 = 4096
net.ipv4.neigh.default.gc_thresh1 = 1024

net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.default.arp_ignore = 1

随后运行

sysctl -p /etc/sysctl.d/00-opti-vt.conf

或者直接要重启服务器

reboot

不要盲目复制粘贴到所有服务器上。对于一个内存很小（如 1GB）的 VPS，过大的缓冲区可能会消耗过多内存，反而导致系统不稳定。