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

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Date:	Tue, 02 Nov 2010 11:10:19 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Aidar Kultayev <the.aidar@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Ted Ts'o <tytso@....edu>,
	Pekka Enberg <penberg@...nel.org>,
	Chris Mason <chris.mason@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.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 Sat, 2010-10-30 at 21:02 +0800, Aidar Kultayev wrote:
> Hi,
> 
> here is what I have :
> 
> .ext4 mounted with data=ordered
> .-tip tree ( uname -a gives : Linux pussy 2.6.36-tip+ )
> 
> here is the latencytop & powertop & top screenshot:
> 
> http://picasaweb.google.com/lh/photo/bMTgbVDoojwUeXtVdyvIKw?feat=directlink
> 
> the system is/was doing :
> .dd if=/dev/zero of=test.10g bs=1M count=10000;rm test.10g
> .netbeans
> .compiling gcc-4.5.1
> .running VBox, which wasn't doing any IO. The guest os was idle in other words
> .vlc
> .chromium
> .firefox
> and bunch of other small stuff.
> 
> Even without having running DD, the mouse cursor would occasionally
> lag. The alt+tab effect in KWin would take 5+seconds to workout.
> When I run DD on top of the workload it consistently made system much
> more laggy. The cursor would freeze much more frequent. It is like if
> you drag your mouse physically, but the cursor on the screen would
> jump discretely, in other words there is no continuity.
> Music would stop.
> 
> I am free to try out anything here.
would you please try the vm_exec protect patch here?
http://www.spinics.net/lists/linux-mm/msg09617.html

Thanks,
Shaohua

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