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 [log in to unmask] Boulder, CO 80301 http://www.nwra.com