"SCo" <sylvain@coutant.info.nospam> schrieb im Newsbeitrag
news:4010eefc$0$22300$626a54ce@news.free.fr...
> > IIRC path MTU values that where decreased are checked every 10 minutes,
> > while increases are checked every 30 minutes. Thus I doubt that it is
just
> > your AIX server's fault that the packets really stay small after they
> where
> > decreased.
>
> But they are not decreased because of PMTU but only because network became
> slow during a few milliseconds. Nothing to do with PMTU. In case the
network
> become fast again, the packet size should increase back the same way it
was
> decreased when the network became slow. Obviously, this is not the case.
>
> Regards,
> Sylvain.
>

I already understood that your packet size stays small and I hinted to some
areas for further investigation. It does not help when you just pretend that
the packets stay small without fostering this thread with further details.
That packets do not increase again is still no prove that it is your
server's problem. Therefore I would suggest you to post the output of:
# no -a |grep pmtu
# lslpp -l bos.net.tcp.*
# lsattr -El ent0 (use your adapter in question)
# lsattr -El en0 (use your adapter in question)
I would also be interested in what type of network you use that becomes
intermittent slow and then fast again. Does it become slow again within the
30 minute pmtu_rediscover_interval? Did you change the interval to 1
minute? Did that change anything?

Regards,
Andreas