Knowledge base - Posts tagged with: kernel
Basic Linux Kernel Networking Tuning
Network Stack TCP tuning
These changes should go into /etc/sysctl.conf
The default maximum for buffers allocated to TCP are totally insane. While the most optimal numbers need to be calculated for specific environments the following settings are a good start:
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
Increase Linux auto-tuning TCP buffer limits:
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
Use robust congestion control:
net.ipv4.tcp_congestion_control=htcp
Don't cache ssthresh from previous connection - well, duh:
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1
Pretend we always have a gigabit ethernet, even if we only have fast ethernet:
net.core.netdev_max_backlog = 2500
Interface Transmit Queue Size
The default setting is idiotic. Change it to something sane:
