linux-kernel - Re: NFSROOT with NFS Version 3

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Date:	Fri, 17 Nov 2006 11:20:17 -0500
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Christoph Pleger <Christoph.Pleger@...-dortmund.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: NFSROOT with NFS Version 3

On Fri, 2006-11-17 at 16:40 +0100, Christoph Pleger wrote:
> Hello,
> 
> I tried to switch an NFSROOT-Environment from NFS version 2 to NFS
> version 3, but unfortunately my test client machine now hangs every time
> after booting as soon as some bigger file system activity should occur.
> I tried Kernel 2.6.14.7 and Kernel 2.6.16.32.
> 
> The problem did not occur with NFS version 2.
> 
> Does anybody know the problem and/or a solution?

That is almost always due to the difference in r/wsize that the Linux
NFS server advertises for v2 and v3 combined with using UDP. If you have
poor networking, then don't use UDP, and certainly not with 32k r/wsize.

IOW: try either setting the mount options "rsize=8192,wsize=8192", or
the option "proto=tcp"

Cheers
  Trond

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