sysctl openwrt latency
- cat << 'EOF' > /etc/sysctl.d/99-latency.conf
- # --- Queueing & TCP Congestion ---
- # Pair CAKE/FQ with BBR for minimal bufferbloat and fast recovery
- net.core.default_qdisc = cake
- net.ipv4.tcp_congestion_control = bbr
- # --- Reduce Bufferbloat & Latency Spikes ---
- # Shrink max backlog queues to drop/process stale packets faster
- net.core.netdev_max_backlog = 1000
- net.ipv4.tcp_max_syn_backlog = 1024
- net.ipv4.tcp_max_tw_buckets = 10000
- # --- Fast Packet Processing & TCP Timers ---
- # Enable Fast Open to eliminate SYN-ACK round trips
- net.ipv4.tcp_fastopen = 3
- # Disable slow start after idle so connection bursts don't ramp up latency
- net.ipv4.tcp_slow_start_after_idle = 0
- # Enable selective ACKs and explicit congestion notification
- net.ipv4.tcp_sack = 1
- net.ipv4.tcp_dsack = 1
- net.ipv4.tcp_ecn = 1
- # Reduce orphan retries for faster socket cleanup
- net.ipv4.tcp_orphan_retries = 1
- # --- Memory & Socket Buffers (Optimized for Small Packets / Low Delay) ---
- # Keep socket buffers modest to prevent deep queuing at the socket layer
- net.core.rmem_default = 262144
- net.core.wmem_default = 262144
- net.core.rmem_max = 4194304
- net.core.wmem_max = 4194304
- net.ipv4.tcp_rmem = 4096 87380 4194304
- net.ipv4.tcp_wmem = 4096 65536 4194304
- # --- Neighbor / ARP Table Latency Fixes ---
- # Keep ARP entries warm and prevent stale neighbor lookup delays
- net.ipv4.neigh.default.gc_stale_time = 120
- net.ipv4.neigh.default.base_reachable_time_ms = 30000
- EOF
Pasted 2026-09-08 11:35:44
Short link:
Short link:
