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
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