linux-kernel - Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)

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Date:	Fri, 1 Feb 2008 22:54:35 +0100
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Steven Rostedt" <srostedt@...hat.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)

On 01/02/2008, Ingo Molnar <mingo@...e.hu> wrote:
>
> thanks - i cannot reproduce it on my usual suspend/resume testbox
> because e1000 broke on it, and this is a pretty annoying regression.
> We'll have to undo the hung-tasks detection feature if it's not fixed
> quickly. (there's no point in debugging features that _add_ bugs)

I can reproduce it and Peter's patch does fix it for me.

e.g.
root@...th:/sys/devices/system/cpu/cpu1# time echo 0 > online
real    0m6.743s
root@...th:/sys/devices/system/cpu/cpu1# time echo 0 > online
real    0m7.770s

I've observed delays from ~3 s. up to ~8 s. (out of ~20 tests) so the
10s. delay of msleep_interruptible() might be related but
I'm still looking for the reason why this fix helps (and what goes
wrong with the current code).


>
>         Ingo
>

-- 
Best regards,
Dmitry Adamushko
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