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 Technical Manager 303-415-9701 x222 NWRA, Boulder Office FAX: 303-415-9702 3380 Mitchell Lane [log in to unmask] Boulder, CO 80301 http://www.nwra.com