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

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Message-ID: <20101028135038.GA32157@elte.hu>
Date:	Thu, 28 Oct 2010 15:50:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Hellwig <hch@...radead.org>
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


* Christoph Hellwig <hch@...radead.org> wrote:

> 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.

Yes, that was my point.

Thanks,

	Ingo
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