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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prev parent reply other threads:[~2008-11-26 22:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1226760254.5089.11.camel@chevrolet>
[not found] ` <430c4fa50811180551r67d5d680tf1ffa493604ac4ea@mail.gmail.com>
2008-11-23 21:48 ` Extreme slowness with xfs [WAS: Re: Slowness with new pc] Stian Jordet
2008-11-23 22:25 ` Justin Piszcz
2008-11-24 0:19 ` Stian Jordet
2008-11-24 9:50 ` Justin Piszcz
2008-11-24 23:36 ` Stian Jordet
2008-11-24 23:52 ` Justin Piszcz
2008-11-25 0:09 ` Sven-Haegar Koch
2008-11-25 20:44 ` Stian Jordet
2008-11-25 21:22 ` Eric Sandeen
[not found] ` <1227649893.6557.10.camel@oldsmobile>
2008-11-25 22:02 ` David Sparks
2008-11-25 22:31 ` Stian Jordet
2008-11-25 1:36 ` Eric Sandeen
[not found] ` <1227647010.7992.34.camel@chevrolet>
2008-11-26 12:30 ` Martin Steigerwald
2008-11-26 21:43 ` Dave Chinner [this message]
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