From: Greg Banks <gnb@sgi.com>
Subject: Re: Poor NFS performance, kernel 2.6.6.
Date: Wed, 2 Jun 2004 23:00:54 +1000
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To: Jeffrey Layton <jtlayton@poochiereds.net>
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On Wed, Jun 02, 2004 at 08:33:53AM -0400, Jeffrey Layton wrote:
> The machines are different hardware, but local write performance is
> pretty comparable (in fact the 2.6 box is a faster machine, and is
> currently less utilized than the 2.4 kernel machine). Both are using
> reiserfs as the underlying filesystem.

What is the speed on each server for a local dd from /dev/zero to disk?
What actual kernel versions are you running?

> Write performance in this cursory test was 10x worse!

This completely fails to correlate with my experience.  I'm using XFS
on 2.6.4 and I see single thread streaming write performance increase
by about 25% going from 2.4 to 2.6.  Other metrics show improvements
as good or better, except the scalability of UDP reads tops out lower.

Greg.
-- 
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.


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