[CentOS] nfs slow?

Craig White craigwhite at azapple.com
Tue Dec 16 23:05:02 UTC 2008


On Wed, 2008-12-17 at 00:00 +0100, Davide Cittaro wrote:
> 
> On Dec 16, 2008, at 11:49 PM, Craig White wrote:
> > 
> > 
> > 
> > larger rsize/wsize values do not necessarily translate to faster and
> > I
> > was of the opinion that going over 65536 wasn't going to help at
> > all.
> > With some NFS servers, a smaller rsize/wsize is better. (8192 or
> > 16384)
> > but that is the point of tuning I suppose.
> > 
> > 
> 
> 
> I've tried r/w sizes from 8k to auto (that is 104k for Solaris server
> and 32k for FreeBSD server)... there are minor changes in max speed
> (let's say it ranges from 70 to 80 MB/s). 
> 
> > hubs/switches, wires and the network cards themselves all can impact
> > performance - it's not necessarily CentOS itself.
> 
> 
> Well, as long as Gentoo linux and FreeBSD clients show ~100 MB/s...
> BTW I'm using 
> 2.6.18-92.1.18.el5.centos.plus
> kernel on x86_64 hardware... I need to use CentOS (I migrated from
> Gentoo for sake of simplicity) but this NFS issue really... well, it
> is not a good thing :-)
----
out of curiousity...why are you using the plus kernel? Do you need it to
support particular hardware? Is it possible to boot/test with the
standard kernel?

Craig



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