linux-kernel - Re: 2.6.36 io bring the system to its knees

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Message-ID: <20101028134724.GB4416@infradead.org>
Date:	Thu, 28 Oct 2010 09:47:24 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Aidar Kultayev <the.aidar@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.36 io bring the system to its knees

On Thu, Oct 28, 2010 at 03:30:36PM +0200, Ingo Molnar wrote:
> > Looks mostly VFS to me. Aidar, does killing Picasa make things smoother for you? 
> > If so, maybe the VFS scalability patches will help.
> 
> Hm, but the VFS scalability patches mostly decrease CPU usage, and does that mostly 
> on many-core systems.

If you have i_mutex contention they are not going to change anything.
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