From: "Lever, Charles" <Charles.Lever@netapp.com>
Subject: RE: RH 7.3 kernels and NFS performance
Date: Wed, 7 Aug 2002 08:45:33 -0700
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <6440EA1A6AA1D5118C6900902745938E50D1B4@black.eng.netapp.com>
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Cc: nfs@lists.sourceforge.net
To: "'jeffrey.b.layton@lmco.com'" <jeffrey.b.layton@lmco.com>
Errors-To: nfs-admin@lists.sourceforge.net

hi jeff-

>    I remember reading on the list about the terrible NFS
> performance of the latest RH kernels. Would someone
> care to summarize this for me (UDP or TCP, etc.)? Also,
> does anyone have any rough estimates of the performance
> hit?

if you are referring to bad NFS client performance, this
is due to a bug in the Linux IP fragmentation logic which
causes it to send part of a fragmented packet, and drop
the rest, if it runs out of socket buffer space during
the fragmentation process.

thus it only affects NFS over UDP.

there is an easy workaround:  enlarge the size of the
RPC transport socket's buffers.  see the NFS FAQ for
instructions.

a bug was reported in the eepro100 driver too, and that
may have some effect on client performance.


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