Re: [squid-users] Performance tunning !

Joe Cooper wrote:

> Do some reading on MTU. The simplest thing is probably to enforce a
> small enough MTU on the cache network interfaces to make the problem
> disappear...this probably isn't going to lead to the best performance
> (larger MTU leads to higher network throughput and lower load on
> equipment, all other things being equal), but it can probably fix the
> errors you're seeing.

Actually the simplest fix if your redirection method cannot support PMTUD is
to disable the use of PMTUD. If you have dialup users or similar it is damn
impossible to tell the smallest MTU you need to support to your clients
unless you are willing to go for a rediciously small MTU value just to
support the few that are using very small MTU (commonly done for better
interactive performance on a shared link, such as someone doing SSH and
downloading at the same time over a modem).

The downside is that you MUST ONLY disable PMTUD for the links to your
clients. You should not disable PMTUD on outgoing connections to the Internet
or you may well find that you cannot reach parts of the Internet..

Regards
Henrik
Received on Wed Jun 26 2002 - 03:35:14 MDT