Re: [PATCH 7/9] PM: Measure device suspend and resume times
From: Rafael J. Wysocki
Date: Fri Sep 11 2009 - 18:17:33 EST
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@xxxxxxx>
>
>
>
> Measure and print the time of suspending and resuming all devices.
>
>
>
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
>
>
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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