linux-kernel - Re: Lots of disk activity on resume from s2ram

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Message-Id: <200710161412.26407.rjw@sisk.pl>
Date:	Tue, 16 Oct 2007 14:12:26 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Johan Brannlund <johan_brn@...oo.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Lots of disk activity on resume from s2ram

On Monday, 15 October 2007 23:53, Johan Brannlund wrote:
> Hi. I've noticed that with recent kernels (starting somewhere between 
> 2.6.20 and 2.6.22) I sometimes get *lots* of disk activity on resume from 
> suspend to ram. About 2/3 of the time, the system resumes normally but in 
> the remaining 1/3 of the time, the hard drive light stays on almost solid 
> and the machine is very, very slow to respond. The only way I've found to 
> reliably recover from this is if I can get to a command prompt fast 
> enough and do "shutdown -r now". There's not much cpu activity at all, it 
> just seems to be disk io that's killing interactivity. This also happens 
> if I resume just from an empty gnome desktop with no applications 
> running, so I don't think it's due to swapping.
> 
> Some kernels affected: 2.6.22, 2.6.23+hrt patches, Ubuntu Gutsy kernel 
> (2.6.22-14). These are all 64-bit kernels running on an HP nx6125 laptop 
> - single-core Turion 64 processor, 1 gig of ram. To the best of my 
> recollection, this problem did *not* appear with 2.6.20.
> 
> I put some dmesg output from the vm block dumping and some vmstat output 
> at http://nullinfinity.org/tmp/s2ram/ . The dmesg logs are from the same 
> resume, just a little while apart. The vmstat is from a different resume.
> 
> Any workarounds, patches, tips for further debugging etc would be 
> appreciated.

Please file a bug report at http://bugzilla.kernel.org , under
"Power management"->Hibernation/Suspend and add my address to the CC list.

Greetings,
Rafael
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