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List:       linux-nfs
Subject:    Re: [NFS] redhat 2.4.18-5 client huge slowdown
From:       Rex Dieter <rdieter () math ! unl ! edu>
Date:       2002-07-11 19:29:34
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Rex Dieter <rdieter@math.unl.edu> wrote:
> Raphael Clifford wrote:
> > I was wondering if everyone else is experiencing huge nfs write
> > slowdowns using redhat kernel 2.4.18-5 (as opposed to 2.4.18-4).  I am
>
> Yes, I've also experienced a huge nfs client slowdown (~50k/sec writes) on
> 'sync' nfs mounts with the 2.4.18-5 kernel... See me bugzilla report:
> http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=67199
...

Here's some interesting data (on switched fast ethernet) to chew on (using 
Redhat's 2.4.18-5 kernel on both server and client):
Server(1)  Client(2)  Speed 
async      async     ~8.5MB/sec 
async      sync      ~6.5MB/sec 
sync       async     ~350K/sec 
sync       sync      ~50k/sec 
 
(1) using the 'async/sync' option in /etc/exports
(2) using the 'async/sync' option when mounting, ie, mount -t nfs -o sync ...

Is this really the kind of performance I should expect to get? (I hope not)

-- Rex


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