2.12. Reduce TCP Performance Spikes

Turn timestamps off to reduce performance spikes related to timestamp generation. The sysctl command controls the values of TCP related entries, setting the timestamps kernel parameter found at /proc/sys/net/ipv4/tcp_timestamps.
  • Turn timestamps off with the following command:
    ~]# sysctl -w net.ipv4.tcp_timestamps=0
    net.ipv4.tcp_timestamps = 0
    
  • Turn timestamps on with the following command:
    ~]# sysctl -w net.ipv4.tcp_timestamps=1
    net.ipv4.tcp_timestamps = 1
    
  • Print the current value with the following command:
    ~]# sysctl net.ipv4.tcp_timestamps
    net.ipv4.tcp_timestamps = 1
    
    The value 1 indicates that timestamps are on, the value 0 indicates they are off.