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 [email protected]
Boulder, CO 80301 http://www.nwra.com
