TCP/IP stack tuning using fasttimo parameter

Configure the fasttimo parameter to address issues on AIX® systems where the high frequency of requests from a single LDAP client, causes the ibmslapd search query responses to become slower compared to other platforms.

The fasttimo parameter lets you set the millisecond delay for the TCP fast timeout timer. This timeout controls how often the system scans the TCP control blocks to send delayed acknowledgments.

For example:

no -p -o fasttimo=50

Default: 200; Range: 50 to 200 milliseconds.

The "-p" option for the no command specifies that the new value is also put into the next reboot values. This means that the change is effective after the next reboot.

The change takes effect immediately. Alternatively, for a permanent change add the no command to /etc/rc.net.