I was thinking about that too.

When /etc/tunables and "smit tuning" came in with AIX 5, the way you tune certain things changed.

Previously one would add lines to /etc/rc.net like this, for web server tuning for example:
# allow delayed acks
        /usr/sbin/no -o sack=1 >>/dev/null 2>&1
        /usr/sbin/no -o delayack=3 >>/dev/null 2>&1
        /usr/sbin/no -o delayackports={80} >>/dev/null 2>&1

The new method for doing this sort of thing through smit runs the following command:
no -r -o -o sack='1' -o delayack='3' delayackports='{80}'

So it all comes back nicely to "man no" for most network tuning.

greetings..--   
 
In aix 5.2 there is form of lowering the time of the status lask_ack at the present time the status it remains for about five minutes (the command that allows me to see the state is netstat) 
 
thank you   
sergio