From: Yann Dupont <Yann.Dupont@univ-nantes.fr>
To: Christoph Hellwig <hch@infradead.org>
Cc: stan@hardwarefreak.com, xfs@oss.sgi.com
Subject: Re: Bad performance with XFS + 2.6.38 / 2.6.39
Date: Wed, 04 Jan 2012 14:06:15 +0100 [thread overview]
Message-ID: <4F044EC7.3030203@univ-nantes.fr> (raw)
In-Reply-To: <20120104123331.GA12204@infradead.org>
On 04/01/2012 13:33, Christoph Hellwig wrote:
> On Tue, Jan 03, 2012 at 09:20:05AM +0100, Yann Dupont wrote:
>>> As it is, I can't see any material difference between the traces.
>>> both reads and writes are taking the same amount of time to service,
>>> so I don't think there's any problem here.
>>
>> ok,
>>>
>>> I do recall that some years ago that we changed one of the ways we
>>
>> Do you recall exactly what some years ago means ? Is this post 2.6.26 era ?
>
> The only thing that I remember is Jens switching xfs_buf_wait_unpin from
> schedule to io_schedule in "block: remove per-queue plugging", which
> went into Linux 2.6.39. With this processed that wait for buffers to
> be unpinned now count towards the load average.
>
Ok, that's probably the root cause. As I already said, I don't
experience performance regression right now.
Thanks a lot for the explaination.
Cheers,
--
Yann Dupont - Service IRTS, DSI Université de Nantes
Tel : 02.53.48.49.20 - Mail/Jabber : Yann.Dupont@univ-nantes.fr
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prev parent reply other threads:[~2012-01-04 13:09 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-11 12:45 Bad performance with XFS + 2.6.38 / 2.6.39 Xupeng Yun
2011-12-11 23:39 ` Dave Chinner
2011-12-12 0:40 ` Xupeng Yun
2011-12-12 1:00 ` Dave Chinner
2011-12-12 2:00 ` Xupeng Yun
2011-12-12 13:57 ` Christoph Hellwig
2011-12-21 9:08 ` Yann Dupont
2011-12-21 15:10 ` Stan Hoeppner
2011-12-21 17:56 ` Yann Dupont
2011-12-21 22:26 ` Dave Chinner
2011-12-22 9:23 ` Yann Dupont
2011-12-22 11:02 ` Yann Dupont
2012-01-02 10:06 ` Yann Dupont
2012-01-02 16:08 ` Peter Grandi
2012-01-02 18:02 ` Peter Grandi
2012-01-04 10:54 ` Yann Dupont
2012-01-02 20:35 ` Dave Chinner
2012-01-03 8:20 ` Yann Dupont
2012-01-04 12:33 ` Christoph Hellwig
2012-01-04 13:06 ` Yann Dupont [this message]
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