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

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Date:	Sat, 6 Nov 2010 12:10:42 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Sanjoy Mahajan <sanjoy@...n.edu>
Cc:	Dave Chinner <david@...morbit.com>, Jesper Juhl <jj@...osbits.net>,
	Chris Mason <chris.mason@...cle.com>,
	Ingo Molnar <mingo@...e.hu>, 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>,
	Thomas Gleixner <tglx@...utronix.de>, Ted Ts'o <tytso@....edu>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Shaohua Li <shaohua.li@...el.com>,
	Steven Barrett <damentz@...il.com>
Subject: Re: 2.6.36 io bring the system to its knees

On Fri, 5 Nov 2010 08:48:13 -0400
Sanjoy Mahajan <sanjoy@...n.edu> wrote:

> Dave Chinner <david@...morbit.com> wrote:
> 
> > I think anyone reporting a interactivity problem also needs to
> > indicate what their filesystem is, what mount paramters they are
> > using, what their storage config is, whether barriers are active or
> > not, what elevator they are using, whether one or more of the
> > applications are issuing fsync() or sync() calls, and so on.
> 
> Good idea.  
> 
> The filesystems are all ext3 with default mount parameters.  The
> dmesgs say that the filesystems are mounted in ordered data mode and
> that barriers are not enabled.

btw few more things to try (from my standard rc.local script):

echo 4096 > /sys/block/sda/queue/nr_requests

for i in `pidof kjournald` ; do ionice -c1 -p $i ; done

echo 75 >  /proc/sys/vm/dirty_ratio


(replace sda with whatever your disk is of course)

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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