On 07/18/2012 02:09 PM, Vladimir Mosgalin wrote:
> Hi Orion Poplawski!
>
>   On 2012.07.18 at 09:15:39 -0600, Orion Poplawski wrote next:
>
>>>> Also running powertop and comparing wakeups/sec and general output on
>>>> guests might give some hint.
>>
>> powertop was a good suggestion.  It appears that toggling the
>> Autosuspend for USB device QEMU USB Tablet [QEMU 0.12.1] tunable has
>> a big effect and brings it in line with SL6.
>
> Good catch; I'll have to remember that.
>
>> # cat /sys/devices/pci0000:00/0000:00:01.2/usb1/power/autosuspend
>> 2
>> # cat  /sys/devices/pci0000:00/0000:00:01.2/usb1/1-1/power/level
>> on
>>
>> So it appears that SL6 is setting to auto automatically, but Fedora
>> is not.  I wonder why.
>
> Different udev rules. Actually, with current udev autosuspend is
> disabled for HID devices in Fedora (*), because autosuspending
> keyboard/mouse/touchpad introduces lags. Most likely this shouldn't
> matter for virtual devices.. Guess this should be reported to fedora
> guys so they'll include QEMU devices for autosuspend.
>
>
> (*) https://lists.fedoraproject.org/pipermail/package-announce/2012-June/081999.html
>

I filed https://bugzilla.redhat.com/show_bug.cgi?id=841368


-- 
Orion Poplawski
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