From: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
To: Jan Knutar <jknutar@nic.fi>
Cc: jamagallon@ono.com, linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Finding what is stuck...
Date: Tue, 02 Sep 2008 10:34:46 +0100 [thread overview]
Message-ID: <48BD08B6.4040707@tuffmail.co.uk> (raw)
Jan Knutar wrote:
> On Tuesday 02 September 2008, J.A. Magallón wrote:
>
>> I'm running 2.6.27-rc5-git2 on an Aspire One.
>> The system is in general pretty responsive, but sometimes it just
>> gets totally stuck. Even the mouse stops.
>>
>> It looks related to disk (SSD) access, but I'm not totally sure.
>
> Are you hitting swap at all? Does it have swap?
>
> On my N810 tablet there can be a huge slowdown if it starts swapping.
> The first time it dips into swap is relatively painless when stuff gets
> written out sequentially, but after that when writes are mostly random
> the throughput drops to a few kilobytes per second, causing massive
> slowdown... The MMC/SD cards hate random write, and I expect SSDs are
> no better.
>
> iostat -x -k 10
> in a terminal is useful. Check the iowait and util% numbers after/during
> slowdown...
My experience on the EeePC is similar. I didn't look into it much but I
think it helped a lot switching to the "noop" ioscheduler
(echo noop > /sys/block/sda/queue/scheduler)
as opposed to the default CFQ, if you haven't already done so.
Alan
next reply other threads:[~2008-09-02 9:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-02 9:34 Alan Jenkins [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-09-02 0:04 Finding what is stuck J.A. Magallón
2008-09-02 0:08 ` Arjan van de Ven
2008-09-02 0:12 ` J.A. Magallón
2008-09-03 23:00 ` J.A. Magallón
2008-09-03 23:50 ` Arjan van de Ven
2008-09-02 1:53 ` Jan Knutar
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