linux-kernel - Re: [GIT PULL] PM updates for 2.6.33

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Date:	Sun, 6 Dec 2009 13:17:02 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [GIT PULL] PM updates for 2.6.33

On Sun, 6 Dec 2009 15:36:40 -0500 (EST)
Alan Stern <stern@...land.harvard.edu> wrote:

> On Sun, 6 Dec 2009, Arjan van de Ven wrote:
> 
> > btw I instrumented both the suspend and resume, and made graphs out
> > of it for my laptop (modern laptop with Intel cpu/wifi/graphics of
> > course).
> > 
> > http://www.fenrus.org/graphs/suspend.svg
> > http://www.fenrus.org/graphs/resume.svg
> > 
> > (also attached for convenience)
> > 
> > the resume clearly shows that all this talking about PCI stuff is
> > completely without practical merit.. it's the USB stuff where the
> > time is spent.
> 
> Arjan, can you try testing the USB timings again with the patch below 
> (for vanilla 2.6.32)?
> 
> Fair warning: I just composed this and haven't tried it out myself.

unfortunately it does not make a difference that I can notice in the
graphs.

http://www.fenrus.org/graphs/resume2.svg

the resume problem seems to be that we resume all the hubs sequentially,
much like we used to discover them sequentially during boot....

I do not know how much I'm asking for, but would it be sensible to do a
similar thing for hub resume as we did for boot? eg start resuming them
all at the same time, so that the mandatory delays of these hubs will
overlap ?



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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