linux-kernel - Re: [linux-pm] [RFC] Asynchronous suspend/resume

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Date:	Sun, 27 Dec 2009 09:03:25 +1100
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Jiri Slaby <jslaby@...e.cz>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [linux-pm] [RFC] Asynchronous suspend/resume - test results

Hi.

Rafael J. Wysocki wrote:
> Yes, it did.  Please compare these lines:
> 
> (from the "sync" dmesg):
> [   31.640676] PM: freeze of devices complete after 709.277 msecs
> [   37.087548] PM: restore of devices complete after 4973.508 msecs
> 
> (from the "async" dmesg):
> [   25.600067] PM: freeze of devices complete after 620.429 msecs
> [   29.195366] PM: restore of devices complete after 3057.982 msecs
> 
> So clearly, there's a difference. :-)

Oh okay.

It still feels like a long time. How do I find out which device took the
longest? It looks to me like the patch is only recording when things
start their restore, not when they finish.

> Of course, in terms of total hibernate/restore time this is only a little
> improvement, but if that was suspend to RAM and resume, the reduction of
> the device resume time by almost 2 s would be a big deal.
> 
>> I'll see if I can find the time to do the other computers, then.
> 
> I'd appreciate that very much.

I'm not sure I'll find the time now - it's Sunday morning here and we
still have packing and so on to do after I take this morning's service.

Sorry!

Regards,

Nigel
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