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Message-ID: <787b0d920705051848u142562a5lb5d581d0e5616cc8@mail.gmail.com>
Date: Sat, 5 May 2007 21:48:35 -0400
From: "Albert Cahalan" <acahalan@gmail.com>
To: mason.b.cabot@intel.com, akpm@linux-foundation.org,
       linux-kernel@vger.kernel.org, jra@samba.org, tridge@samba.com
Subject: Re: Ext3 vs NTFS performance
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Andrew Morton writes:
> "Cabot, Mason B" <mason.b.cabot@intel.com> wrote:

>> I've been testing the NAS performance of ext3/Openfiler 2.2 against
>> NTFS/WinXP and have found that NTFS significantly outperforms ext3 for
>> video workloads. The Windows CIFS client will attempt a poor-man's
>> pre-allocation of the file on the server by sending 1-byte writes at
>> 128K-byte strides, breaking block allocation on ext3 and leading to
>> fragmentation and poor performance. This will happen for many
>> applications (including iTunes) as the CIFS client issues these
>> pre-allocates under the application layer.
>
> Oh my gawd, what a stupid hack.  Now we know what the
> MS interoperability lab has been working on.

Stupid or not, this is their protocol. The cifs filesystem
driver needs a patch to do this. Probably that'll help get
better performance when Linux is writing to a Windows server.
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