wiki:GPFS_Tuning_Kernel_Net
Sysctl variable Default 2.6 Suggested
net.ipv4.conf.all.arp_filter 0 1
net.ipv4.conf.all.rp_filter 0 1
net.ipv4.tcp_max_syn_backlog 1024 4096
net.ipv4.ipfrag_low_thresh 196608 262144
net.ipv4.ipfrag_high_thresh 262144 393216
net.core.netdev_max_backlog 300 2000
net.core.rmem_default 135168 262144
net.core.rmem_max 131071 8388608
net.core.wmem_default 135168 262144
net.core.wmem_max 131071 8388608
net.ipv4.ip_local_port_range 32768 61000 1024 65535
net.ipv4.ip_no_pmtu_disc 0 0
net.ipv4.tcp_rmem 4096 87380 174760 8192 262144 4194304
net.ipv4.tcp_sack 1 0
net.ipv4.tcp_syncookies 1 0
net.ipv4.tcp_timestamps 1 0
net.ipv4.tcp_window_scaling 1 1
net.ipv4.tcp_wmem 4096 16384 131072 8192 262144 4194304

  • you can use below sysctl command or download our script
    $ sysctl -w net.ipv4.conf.all.arp_filter=1
    $ sysctl -w net.ipv4.conf.all.rp_filter=1
    $ sysctl -w net.ipv4.tcp_max_syn_backlog=4096
    $ sysctl -w net.ipv4.ipfrag_low_thresh=262144
    $ sysctl -w net.ipv4.ipfrag_high_thresh=393216
    $ sysctl -w net.core.netdev_max_backlog=2000
    $ sysctl -w net.core.rmem_default=262144
    $ sysctl -w net.core.rmem_max=8388608
    $ sysctl -w net.core.wmem_default=262144
    $ sysctl -w net.core.wmem_max=8388608
    $ sysctl -w net.ipv4.ip_local_port_range="1024 65535"
    $ sysctl -w net.ipv4.ip_no_pmtu_disc=0
    $ sysctl -w net.ipv4.tcp_rmem="8192 262144 4194304"
    $ sysctl -w net.ipv4.tcp_sack=0
    $ sysctl -w net.ipv4.tcp_syncookies=0
    $ sysctl -w net.ipv4.tcp_timestamps=0
    $ sysctl -w net.ipv4.tcp_window_scaling=1
    $ sysctl -w net.ipv4.tcp_wmem="8192 262144 4194304"
    
Last modified 17 years ago Last modified on Feb 26, 2008, 5:46:41 PM

Attachments (1)

Download all attachments as: .zip