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From: Simon Huggins <huggie@earth.li>
To: linux-kernel@vger.kernel.org
Subject: Scheduler broken? sdhci issues with scheduling
Date: Fri, 29 Feb 2008 11:52:57 +0000	[thread overview]
Message-ID: <20080229115256.GG24533@paranoidfreak.co.uk> (raw)

[ Please Cc me on replies ]

I had a bug with sdhci which Pierre Ossman looked at for me.

In the end essentially the fix was to use HZ=1000 and nothing else.
Pierre seemed to think that this was a bug in the scheduler.

I'm interested if someone who groks the scheduler could take a look at
the mmc/* code and see if it's abusing HZ or if there's anything
obviously wrong there.  If it's not then perhaps there really is a bug
in the scheduler?

See
http://list.drzeus.cx/pipermail/sdhci-devel/2008-February/002164.html
http://list.drzeus.cx/pipermail/sdhci-devel/2008-January/002142.html

Here's the log that caused him to suspect the scheduler:
http://list.drzeus.cx/pipermail/sdhci-devel/2007-December/002086.html
and his post saying so:
http://list.drzeus.cx/pipermail/sdhci-devel/2007-December/002087.html

Originally I tried to narrow it down:
http://list.drzeus.cx/pipermail/sdhci-devel/2007-November/002072.html
and shows a commit that seemed to "fix" it for me
http://list.drzeus.cx/pipermail/sdhci-devel/2007-November/002072.html
but apparently the commit I reverted was good
http://list.drzeus.cx/pipermail/sdhci-devel/2007-November/002078.html

I'm happy to provide more information or try different kernels/config
options etc (I really should upgrade the kernel on my laptop anyway).

Thanks,

-- 
----------(   "An excellent suggestion sir, with only two    )----------
Simon ----(            minor flaws...." - Kryten             )---- Nomis
                             Htag.pl 0.0.22

             reply	other threads:[~2008-02-29 12:49 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-29 11:52 Simon Huggins [this message]
2008-02-29 13:34 ` Ingo Molnar
2008-02-29 13:51   ` Ingo Molnar
2008-02-29 14:00     ` Ingo Molnar
2008-02-29 19:39       ` Simon Huggins
2008-02-29 20:39         ` Ingo Molnar
2008-03-01 12:42           ` Simon Huggins
2008-03-01 14:08             ` Pierre Ossman
2008-03-02 10:40 ` Pavel Machek
2008-03-02 18:04   ` Simon Huggins
2008-03-03 19:43   ` Pierre Ossman
2008-03-03 20:38     ` Pavel Machek
2008-03-03 21:05       ` Pierre Ossman
2008-03-13 21:17         ` Simon Huggins
2008-03-15 15:04           ` Pierre Ossman
2008-04-20 21:07             ` Simon Huggins

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