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

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Date:	Sat, 5 Dec 2009 16:45:41 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [GIT PULL] PM updates for 2.6.33

On Sun, 6 Dec 2009 00:55:36 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> 
> Disk spinup/spindown takes time, but also some ACPI devices resume
> slowly, serio devices do that too and there are surprisingly many
> drivers that wait (using msleep() during suspend and resume).  Apart
> from this, every PCI device going from D0 to D3 during suspend and
> from D3 to D0 during resume requires us to sleep for 10 ms (the
> sleeping is done by the PCI core, so the drivers don't even realize
> its there).

maybe a good step is to make a scripts/bootgraph.pl equivalent for
suspend/resume (or make a debug mode that outputs in a compatible format
so that the script can be used as is.. I don't mind either way, and
consider this my offer to help with such a script as long as there's
sufficient logging in dmesg ;-)

that way we can SEE which ones are an issue.... and by how much.


-- 
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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