From: Chris Penney <cpenney@gmail.com>
Subject: Re: SMP, NFS, and 2.6
Date: Wed, 30 Mar 2005 11:40:03 -0500
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	 <20050329211324.GK22447@hmsendeavour.rdu.redhat.com>
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On Tue, 29 Mar 2005 16:13:24 -0500, Neil Horman <nhorman@redhat.com> wrote:
> On Tue, Mar 29, 2005 at 03:58:02PM -0500, Chris Penney wrote:
> > I've heard from some (via google searchs) that there are issues with
> > NFS + SMP when using the 2.6 kernel.  Assuming I'm using 2.6.11.5 w/
> > the NFS-ALL patches applied should I be concerned about running SMP
> > (dual cpu pentium 4 doing pretty much only NFSv3 TCP, but looking
> > toward NFSv4)?
> >
> > Assuming it's ok to use SMP on a heavy use NFS server, should I enable
> > or disable hyperthreading?  I'd assume that for NFS hyperthreading
> > would be good, but that's only a guess.
> >
> > Thanks,
> >
> >    Chris
> >
> Are you referring to the dcache problems with XFS?  I think it was only a
> problem when the NFS server was exporting an XFS file system.  I also haven't
> checked in some time, but I believe those problems have since been fixed.
> 
> Neil

Yes, most of what I read was regarding XFS.  I was not sure if there
were any issues outside of that (I'm using JFS right now).

As far as HyperThreading my testing so far has shown that under heavy
loads enabling HyperThreading on a dual-cpu P4 box seems to be a good
thing.  I would grab 30s of packets with ethereal and look at the NFS
stats and the responce time on writes/commits (which we see a fair bit
of) were at least 33% faster if not more.  I'm not sure if that's an
accurate way to measure though -- I know enough to be dangerous, but
I'm not an expert.

   Chris


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