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Date: Tue, 02 Sep 2008 10:34:46 +0100 From: Alan Jenkins <alan-jenkins@...fmail.co.uk> To: Jan Knutar <jknutar@....fi> CC: jamagallon@....com, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: Finding what is stuck... 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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