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Date:	Thu, 3 May 2007 06:51:40 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Ext3 vs NTFS performance

David Chinner wrote:
> On Tue, May 01, 2007 at 01:43:18PM -0700, Cabot, Mason B 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.
> > 
> > I've posted a brief paper on Intel's OSS website
> > (http://softwarecommunity.intel.com/articles/eng/1259.htm). Please give
> > it a read and let me know what you think. In particular, I'd like to
> > arrive at the right place to fix this problem: is it in the filesystem,
> > VFS, or Samba?

It's a Samba problem.  Samba doesn't do async writes, which v3.0 should have 
fixed.  Did you try that?

> As I commented on IRC to Val Henson - the XFS performance indicates
> that it is not a VFS or Samba problem.

XFS somewhat hides the Samba problem, by efficiently syncing to disk.


Thanks!

--
Al

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