On 07/18/2012 11:17 AM, Orion Poplawski wrote: > On 07/17/2012 04:50 PM, Orion Poplawski wrote: >> While staring at top on my SL6 kvm server waiting for it to crash, I noticed >> that my idle Fedora kvm guests appear to be consuming between 8-12% cpu while >> my idle SL6 guests appear to be consuming between 0.3-2% cpu as shown in the >> qemu-kvm processes in top. In fact I have a Fedora 17 instance running now >> with nothing but kernel processes and the qemu-kvm process still shows it >> using 7-8% cpu. >> >> Does anyone have any insight as to why this would be the case? >> > > 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. >
Hmm, could you please open a bug for that? I guess against F17 qemu for now, might be kernel or udev though. I think this is a regression from previous releases, tablet autosuspend is supposed to work out of the box. Thanks, Cole _______________________________________________ virt mailing list [email protected] https://admin.fedoraproject.org/mailman/listinfo/virt
