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: <20100323112141.7f248f2b.akpm@linux-foundation.org>
Date:	Tue, 23 Mar 2010 11:21:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Anton Starikov <ant.starikov@...il.com>
Cc:	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 Tue, 23 Mar 2010 19:03:36 +0100
Anton Starikov <ant.starikov@...il.com> wrote:

> 
> On Mar 23, 2010, at 7:00 PM, Ingo Molnar wrote:
> >> NOTE! None of those are in 2.6.33 - they were merged afterwards. But they 
> >> are in 2.6.34-rc1 (and obviously current -git). So Anton would have to 
> >> compile his own kernel to test his load.
> > 
> > another option is to run the rawhide kernel via something like:
> > 
> > 	yum update --enablerepo=development kernel
> > 
> > this will give kernel-2.6.34-0.13.rc1.git1.fc14.x86_64, which has those 
> > changes included.
> 
> 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?
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