Tuning my Linux IP Stack

Sat 08 January 2011

Filed under OS

I have gig networking, lots of disks, etc, etc. I need speed Oh, and this improved my internet speeds as well.

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# don't cache ssthresh from previous connection
net.ipv4.tcp_no_metrics_save = 1
# recommended to increase this for 10G NICS
net.core.netdev_max_backlog = 30000

# increase TCP max buffer size setable using setsockopt()
# 16 MB with a few parallel streams is recommended for most 10G paths
# 32 MB might be needed for some very long end-to-end 10G or 40G paths
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

# increase Linux autotuning TCP buffer limits
# min, default, and max number of bytes to use
net.ipv4.tcp_mem = 129940 129940 33554432
net.ipv4.tcp_rmem = 28800 129940 16777216
net.ipv4.tcp_wmem = 28800 129940 16777216

net.ipv4.tcp_congestion_control=cubic
net.ipv4.tcp_mtu_probing=1
net.ipv4.tcp_base_mss=1460


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