linux-kernel - Re: [PATCH 7/9] PM: Measure device suspend and resume times

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Message-Id: <200909120018.23375.rjw@sisk.pl>
Date:	Sat, 12 Sep 2009 00:18:23 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ben Gamari <bgamari.foss@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/9] PM: Measure device suspend and resume times

On Friday 11 September 2009, Ben Gamari wrote:
> On Thu, Sep 10, 2009 at 01:39:21AM +0200, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > Measure and print the time of suspending and resuming all devices.
> > 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> 
> Do you have any rough numbers describing actual suspend/resume times
> before and after this patch set?  Of what order of magnitude is the
> improvement on standard x86 hardware? Just curious.

Depending on the system on which it's run, it gives up to 15% speedup,
but please note that only PCI and ACPI devices are now allowed to
suspend/resume asynchronously, while on my test systems the most significant
stalls are from USB, serio devices and (SATA) drives which are still
suspended/resumed synchronously.

Thanks,
Rafael
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