Linux Shell Scripting Cookbook - Third Edition

Tuning a network

The default values for network buffers may be too small on a system performing many network operations (NFS client, NFS server, and so on).

Examine the values for maximum read buffer memory:

    $ sysctl net.core.rmem_max
    net.core.rmem_max = 124928

Increase values for network servers:

    # sysctl net.core.rmem_max=16777216
    # sysctl net.core.wmem_max=16777216
    # sysctl net.ipv4.tcp_rmem="4096 87380 16777216"
    # sysctl net.ipv4.tcp_wmem="4096 65536 16777216"
    # sysctl net.ipv4.tcp_max_syn_backlog=4096