On 07/18/2012 08:56 AM, Orion Poplawski wrote:
On 07/17/2012 09:28 PM, Vladimir Mosgalin wrote:
Hi Orion Poplawski!
On 2012.07.17 at 16:46:19 -0600, Orion Poplawski wrote next:
That depends heavily on what version of Fedora they are (particularly Rawhide
instances), and what services they are running.
Well, I have a Fedora 17 instance running now with nothing but
kernel processes and the qemu-kvm process still shows using 7-8%
cpu.
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.
SL6:
usb 1-1: Product: QEMU USB Tablet
input: QEMU 0.12.1 QEMU USB Tablet as
/devices/pci0000:00/0000:00:01.2/usb1/1-1/1-1:1.0/input/input4
generic-usb 0003:0627:0001.0001: input,hidraw0: USB HID v0.01 Pointer [QEMU
0.12.1 QEMU USB Tablet] on usb-0000:00:01.2-1/input0
# cat /sys/devices/pci0000:00/0000:00:01.2/usb1/1-1/power/autosuspend
2
# cat /sys/devices/pci0000:00/0000:00:01.2/usb1/1-1/power/level
auto
F17:
[ 3.015642] usb 1-1: Product: QEMU USB Tablet
[ 3.117125] input: QEMU 0.12.1 QEMU USB Tablet as
/devices/pci0000:00/0000:00:01.2/usb1/1-1/1-1:1.0/input/input3
[ 3.117827] generic-usb 0003:0627:0001.0001: input,hidraw0: USB HID v0.01
Pointer [QEMU 0.12.1 QEMU USB Tablet] on usb-0000:00:01.2-1/input0
# 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.
--
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
