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From: Dave Chinner <david@fromorbit.com>
To: Martin Steigerwald <Martin@lichtvoll.de>
Cc: xfs@oss.sgi.com
Subject: Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc]
Date: Thu, 27 Nov 2008 08:43:08 +1100	[thread overview]
Message-ID: <20081126214308.GJ6291@disturbed> (raw)
In-Reply-To: <200811261330.27328.Martin@lichtvoll.de>

On Wed, Nov 26, 2008 at 01:30:26PM +0100, Martin Steigerwald wrote:
> I wonder whether XFS performance with barriers enabled can be improved? 

Not really. It requires fundamentally altering the way the
transaction system works, and that's no easy task. I have a few
things that I'm looking at, but nothing that would be considered
short-term....

> And whether XFS with disabled write cache (via hdparm) but without 
> barriers might even be *faster* than XFS with barriers... One thing to 
> test eventually.

Yes, it often is with SATA drives - it depends on the quality of
the NCQ implementation in the drive. For SCSI drives, no write
cache or barriers is almost always faster than using WC+barriers.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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      reply	other threads:[~2008-11-26 22:49 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-15 14:44 Slowness with new pc Stian Jordet
2008-11-18 13:51 ` Sergio Luis
2008-11-23 21:48   ` Extreme slowness with xfs [WAS: Re: Slowness with new pc] Stian Jordet
2008-11-23 21:48     ` Stian Jordet
2008-11-23 22:25     ` Justin Piszcz
2008-11-23 22:25       ` Justin Piszcz
2008-11-24  0:19       ` Stian Jordet
2008-11-24  0:19         ` Stian Jordet
2008-11-24  9:50         ` Justin Piszcz
2008-11-24  9:50           ` Justin Piszcz
2008-11-24 23:36           ` Stian Jordet
2008-11-24 23:36             ` Stian Jordet
2008-11-24 23:52             ` Justin Piszcz
2008-11-24 23:52               ` Justin Piszcz
2008-11-25  0:09             ` Sven-Haegar Koch
2008-11-25  0:09               ` Sven-Haegar Koch
2008-11-25 20:44               ` Stian Jordet
2008-11-25 20:44                 ` Stian Jordet
2008-11-25 21:22                 ` Eric Sandeen
2008-11-25 21:22                   ` Eric Sandeen
2008-11-25 21:51                   ` Stian Jordet
2008-11-25 22:02                     ` David Sparks
2008-11-25 22:31                       ` Stian Jordet
2008-11-25  1:36             ` Eric Sandeen
2008-11-25  1:36               ` Eric Sandeen
2008-11-25  9:56               ` Justin Piszcz
2008-11-25 10:44                 ` Christoph Hellwig
2008-11-25 10:46                   ` Justin Piszcz
2008-11-25 18:39                 ` Michael Tokarev
2008-11-25 21:03               ` Stian Jordet
2008-11-26 12:30                 ` Martin Steigerwald
2008-11-26 21:43                   ` Dave Chinner [this message]

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