From: Gavin Woodhatch <gavin.woodhatch@netzone.ch>
Subject: nfs performance: read only/gigE/nolock/1Tb per day
Date: Sun, 21 Apr 2002 15:08:47 +0200
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Hi Jason,

I have seen (as posted before) our linux-nfs boxes receiving 9 - 10
MByte/s over a 100  Mbit Network. This was as i was doing some
testing.

Is has to be noted that this is a  sequential read from a 500 MB file.
When reading the "real" data, i hit about 1 - 2 MByte/s

In my Setup, i have not seen a great speed increase in using TCP.
I also don't know how good the linux-nfs Server is at that. I am just
using the client and am using a dedicated NAS Server.

The Block sizes on NFSv2 are from 1024 - 8192. With NFSv3 the Max. is
32768. The Blocksize is dependent on the NFS Version, not on TCP or
UDP Transport. I am using a Stock 2.4.17 Kernel with Trond's NFS-All
Patch.


Kind Regards

Gavin Woodhatch

NetZone Ltd.


> is it possible to change NFS mount size from 1024 to 8192 (especially with GigE).
>   i have tried this and was seeing slowdowns in nfs access, so reverted back to
>   1024 block size.

>   the NFS clients mount the filesystems with:
>   ro,rsize=1024,nolock,hard,bg,intr,retrans=8,nfsvers=3,timeo=10


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