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Message-ID: <20051116220406.25675.qmail@web34102.mail.mud.yahoo.com>
Date: Wed, 16 Nov 2005 14:04:06 -0800 (PST)
From: Kenny Simpson <theonetruekenny@yahoo.com>
Subject: Re: mmap over nfs leads to excessive system load
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
In-Reply-To: <1132178234.8811.64.camel@lade.trondhjem.org>
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--- Trond Myklebust <trond.myklebust@fys.uio.no> wrote:
> I'm getting lost here. Please could you spell out the testcases that are
> not working.
> 
> Are you saying that the combination mmap() + pwrite64() fails on
> O_DIRECT, but works on ordinary open, and that mmap() + ftruncate64()
> always works?
> 
> Cheers,
>   Trond
> 
ftruncate64 works with O_DIRECT
ftruncate64 works w/o O_DIRECT

pwrite64 FAILS with O_DIRECT at ~4GB
pwrite64 works w/o O_DIRECT.

I am re-running these tests to confirm (could take a minute).

All opens are with O_RDWR | O_CREAT | O_LARGEFILE.
All test over GbE w/ jumbo frames (8160 mtu) to a netapp filer (via x-over cable).

-Kenny


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