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

-- 

Vladimir