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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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      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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