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Date: Wed, 22 Jan 2003 14:06:43 +0100
To: Oliver Tennert <tennert@science-computing.de>
Cc: linux-kernel@vger.kernel.org, kw@science-computing.de
Subject: NFS client problem and IO blocksize
In-Reply-To: <Pine.GHP.4.02.10301221121260.4286-100000@alderaan.science-computing.de>
References: <Pine.GHP.4.02.10301221121260.4286-100000@alderaan.science-computing.de>
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Reply-To: trond.myklebust@fys.uio.no
From: Trond Myklebust <trond.myklebust@fys.uio.no>
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>>>>> " " == Oliver Tennert <tennert@science-computing.de> writes:

     > The problem is that the rsize/wsize options seem to be ignored:

     > hal9000:/home/tennert # mount -o
     > nfsvers=3,udp,rsize=1024,wsize=1024 ilka2000:/scr /mnt
     > hal9000:/home/tennert # stat /mnt/Snatch.avi
     >   File: `/mnt/Snatch.avi' Size: 724893696 Blocks: 1415816 IO
     >   Block: 4096 Regular File

rsize/wsize have in principle nothing to do with the blocksize that
'stat' returns. The f_bsize value specifies the 'optimal transfer
block size'. Previously this has been set to the rsize/wsize, but when
you add in O_DIRECT, then 32k becomes too large a value to align
to. For this reason, the f_bsize value was changed to reflect the
actual block size used by the *server*.

Cheers,
  Trond
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