On 07/18/2012 10:12 PM, Orion Poplawski wrote:
On 07/18/2012 11:04 AM, Cole Robinson wrote:
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
Filed against udev since that is where it was fixed in EL6.
https://bugzilla.redhat.com/show_bug.cgi?id=841368
Gerd, any idea why autosuspend isn't working in F17 guest?
Thanks,
Dor
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