Subject: Re: 2.6.36 io bring the system to its knees
From: Shaohua Li <shaohua.li@intel.com>
To: Aidar Kultayev <the.aidar@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, "Ted Ts'o" <tytso@mit.edu>,
        Pekka Enberg <penberg@kernel.org>,
        Chris Mason <chris.mason@oracle.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jens Axboe <axboe@kernel.dk>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Nick Piggin <npiggin@suse.de>, Arjan van de Ven <arjan@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 02 Nov 2010 11:10:19 +0800
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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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