linux-kernel - Re: [Bugme-new] [Bug 15618] New: 2.6.18->2.6.32->2.6.33 huge regression in performance

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Message-Id: <2311E292-F8FE-4C80-A0DA-738CFAE71C50@gmail.com>
Date:	Tue, 23 Mar 2010 20:50:18 +0100
From:	Anton Starikov <ant.starikov@...il.com>
To:	Robin Holt <holt@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [Bugme-new] [Bug 15618] New: 2.6.18->2.6.32->2.6.33 huge regression in performance


On Mar 23, 2010, at 8:22 PM, Robin Holt wrote:

> On Tue, Mar 23, 2010 at 07:25:43PM +0100, Anton Starikov wrote:
>> On Mar 23, 2010, at 7:21 PM, Andrew Morton wrote:
>>>> I will apply this commits to 2.6.32, I afraid current OFED (which I need also) will not work on 2.6.33+.
>>>> 
>>> 
>>> You should be able to simply set CONFIG_RWSEM_GENERIC_SPINLOCK=n,
>>> CONFIG_RWSEM_XCHGADD_ALGORITHM=y by hand, as I mentioned earlier?
>> 
>> Hm. I tried, but when I do "make oldconfig", then it gets rewritten, so I assume that it conflicts with some other setting from default fedora kernel config. trying to figure out which one exactly.
> 
> Have you tracked this down yet?  I just got the patches applied against
> an older kernel and am running into the same issue.


I think you can prevent overwriting this options if you set them in arch/x86/configs/x86_64_defconfig

Anton

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