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Subject: Re: [Bugme-new] [Bug 15618] New: 2.6.18->2.6.32->2.6.33 huge regression in performance
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From: Anton Starikov <ant.starikov@gmail.com>
In-Reply-To: <alpine.LFD.2.00.1003231602130.18017@i5.linux-foundation.org>
Date: Wed, 24 Mar 2010 00:19:15 +0100
Cc: Greg KH <greg@kroah.com>, stable@kernel.org, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       bugzilla-daemon@bugzilla.kernel.org, bugme-daemon@bugzilla.kernel.org,
       Peter Zijlstra <a.p.zijlstra@chello.nl>
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References: <bug-15618-10286@https.bugzilla.kernel.org/> <20100323102208.512c16cc.akpm@linux-foundation.org> <20100323173409.GA24845@elte.hu> <alpine.LFD.2.00.1003231037410.18017@i5.linux-foundation.org> <9D040E9A-80F2-468F-A6CD-A4912615CD3F@gmail.com> <alpine.LFD.2.00.1003231253570.18017@i5.linux-foundation.org> <9FC34DA1-D6DD-41E5-8B76-0712A813C549@gmail.com> <alpine.LFD.2.00.1003231602130.18017@i5.linux-foundation.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
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Tomorrow I will try to patch and check 2.6.33 and see are this patches enough to restore performance or not, because on 2.6.33 kernel performance issue also used to involve somehow crgoup business (and performance was terrible even comparing to broken 2.6.32). If it will not fix 2.6.33, then I will ask to reopen the bug, otherwise I will post to stable@.

Thanks again for help,
Anton.

On Mar 24, 2010, at 12:04 AM, Linus Torvalds wrote:

> 
> 
> On Tue, 23 Mar 2010, Anton Starikov wrote:
>> 
>> I think we got a winner!
>> 
>> Problem seems to be fixed.
>> 
>> Just for record, I used next patches:
>> 
>> 59c33fa7791e9948ba467c2b83e307a0d087ab49
>> 5d0b7235d83eefdafda300656e97d368afcafc9a
>> 1838ef1d782f7527e6defe87e180598622d2d071
>> 4126faf0ab7417fbc6eb99fb0fd407e01e9e9dfe
>> bafaecd11df15ad5b1e598adc7736afcd38ee13d
>> 0d1622d7f526311d87d7da2ee7dd14b73e45d3fc
> 
> Ok. If you have performance numbers for before/after these patches for 
> your actual workload, I'd suggest posting them to stable@kernel.org, and 
> maybe those rwsem fixes will get back-ported.
> 
> The patches are pretty small, and should be fairly safe. So they are 
> certainly stable material.
> 
> 		Linus