Subject: Re: performance problem
From: wesley.craig@umich.edu
Date: Fri Jan 13 1995 - 15:54:04 EST
> From: Brent Dunlock <Brent.Dunlock@asu.edu>
> To: netatalk-admins@umich.edu
> We have a Sparc-20 running Netatalk 1.3.1 with AFS, disk cache turn on
> (about 200MB of it), and standard configuration for SunOS 4.1.3_U1.
> This system runs only Netatalk. The problem we're seeing is that after
> about 45-50 user get on, the repsone time at the MAC's gets really
> bad.
> Looking at vmstat and iostat it seems like the cpu is about 40% idle
> and we have plenty of memory (256MB). I/O seems ok and I don't think
> it's AFS since the major applications that are being accessed are local
> copies (i.e. replicated volumes in AFS).
I'd say your problem is AFS. Try copying your replicated AFS volumes
to local disk space. I'd bet your problems disappear. In my
experience, even when an AFS file is cached on the local disk, it takes
considerably longer to access than local disk space. Also, do you have
cache hit rate ratios for AFS? The only other suggestion I can make is
use a sniffer to pin-point the bottle-necks.
There may be things you can do to tune AFS for netatalk. There's very
little you can do to tune netatalk for AFS.
:wes
This archive was generated by hypermail 2b28 : Sat Dec 18 1999 - 16:23:05 EST