linux-kernel - Re: XFS vs Elevators (was Re: [PATCH RFC] nilfs2: continuous snapshotting file system)

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Message-ID: <Pine.LNX.4.61.0808212031050.4532@dhcppc2>
Date:	Thu, 21 Aug 2008 20:33:50 +0300 (MET DST)
From:	Szabolcs Szakacsits <szaka@...s-3g.org>
To:	Dave Chinner <david@...morbit.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: XFS vs Elevators (was Re: [PATCH RFC] nilfs2: continuous
 snapshotting file system)


On Thu, 21 Aug 2008, Szabolcs Szakacsits wrote:
> On Thu, 21 Aug 2008, Dave Chinner wrote:
> > On Thu, Aug 21, 2008 at 04:04:18PM +1000, Dave Chinner wrote:
> > > 
> > > One thing I just found out - my old *laptop* is 4-5x faster than the
> > > 10krpm scsi disk behind an old cciss raid controller.  I'm wondering
> > > if the long delays in dispatch is caused by an interaction with CTQ
> > > but I can't change it on the cciss raid controllers. Are you using
> > > ctq/ncq on your machine?  
> 
> It's a laptop and has NCQ. It makes no difference if NCQ is enabled or 
> disabled. The problem seems to be XFS only.

The 'nobarrier' mount option made a big improvement:

                    MB/s    Runtime (s)
                   -----    -----------
  btrfs unstable   17.09        572
  ext3             13.24        877
  btrfs 0.16       12.33        793
  nilfs2 2nd+ runs 11.29        674
  ntfs-3g           8.55        865
  reiserfs          8.38        966
  xfs nobarrier     7.89        949
  nilfs2 1st run    4.95       3800
  xfs               1.88       3901

	Szaka
 
-- 
NTFS-3G:  http://ntfs-3g.org
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