linux-kernel - Re: 2.6.25-rc4-git3: Reported regressions from 2.6.24

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Date:	Wed, 12 Mar 2008 16:48:15 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>, Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>
Subject: Re: 2.6.25-rc4-git3: Reported regressions from 2.6.24

On Mon, 2008-03-10 at 01:32 +0100, Rafael J. Wysocki wrote:
> [Due to the lack of time for reviewing all of the email threads related to the
> regressions marked as "unresolved" below, I might have missed some patches
> fixing them.  If you are involved in debugging/fixing any of them, please let
> me know if I should update the list.  Thanks!]
> 
> This message contains a list of some regressions from 2.6.24 reported since
> 2.6.25-rc1 was released, for which there are no fixes in the mainline I know
> of.  If any of them have been fixed already, please let me know.
> 
> If you know of any other unresolved regressions from 2.6.24, please let me know
> either and I'll add them to the list.  Also, please let me know if any of the
> entries below are invalid.
> 
> 
> Listed regressions statistics:
> 
>   Date          Total  Pending  Unresolved
>   ----------------------------------------
>   2008-03-10      138       66          47
>   2008-03-03      115       65          49
>   2008-02-25       90       51          39
>   2008-02-17       61       45          37
> 
> 
> Unresolved regressions
> ----------------------
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=9978
> Subject		: 2.6.25-rc1: volanoMark 45% regression
> Submitter	: Zhang, Yanmin <yanmin_zhang@...ux.intel.com>
> Date		: 2008-02-13 10:30
> References	: http://lkml.org/lkml/2008/2/13/128
> Handled-By	: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
> 		  Balbir Singh <balbir@...ux.vnet.ibm.com>
Peter reverted the load balance patch and 2.6.25-rc4 accepted the reverting patch.

With kernel 2.6.25-rc5, volanoMark has about 6% regression on my 16-core tigerton. If I apply
patch http://lkml.org/lkml/2008/2/20/83 which fixes the tbench regression issue, volanoMark
regression becomes about 4%.

I tried to bisect down which patch caused the last 4%, but found it's very hard. One thing
is many patches depend on the reverted patches. The other thing is I find the testing result
isn't stable since 2.6.25-rc1. The result variation might be more than 15% sometimes. I ran the
testing against the same kernel for many times to get the best result.

I also tried to tune some sched_XXX parameters under /proc/sys/kernel, but didn't get better result
than the default configuration.

Above regression exists on the 2.93GHz 16-core tigerton. With the less powerful 2.40GHz 16-core
tigerton, the regression is less than 1%, but result is not stable and results of many runs might have
about 15% variation.

On 8-core stoakley, the regression is about 1%.

Sorry for the late update.

-yanmin

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