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SubjectRe: High [extra timer interrupt] count in powertop since 2.6.36
On Mon, 1 Nov 2010, Jeremy Fitzhardinge wrote:

> On 10/30/2010 07:52 PM, Ian Kumlien wrote:
>> Hi,
>>
>> I have been searching the list for anyone else seeing this,
>> but i haven't found anything yet - Any ideas on how to debug?
>>
>> From powertop:
>> Top causes for wakeups:
>> 84.7% (1673.3) [extra timer interrupt]
>>
>> Thats a little bit high in my opinion, for some reason it seems to be
>> ignored since the actual number of wakeups seems to be ~367 or so.
>>
>> Ideas? Suggestions?
>
> I'm not sure, but I'm seeing something similar.

using powertop: 1.13

< Detailed C-state information is not P-states (frequencies)
3.21 Ghz 6.0%
2.40 Ghz 0.0%
1.60 Ghz 0.1%
800 Mhz 93.9%


Wakeups-from-idle per second : 441.8 interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
84.3% (2132.0) [extra timer interrupt]
8.1% (205.4) qemu-system-x86
2.4% ( 61.0) [eth1] <interrupt>
1.2% ( 31.1) [eth0] <interrupt>
1.2% ( 29.3) java
1.0% ( 26.3) [ahci] <interrupt>
0.5% ( 13.0) [sky2@pci:0000:05:00.0] <interrupt>
0.5% ( 12.0) kworker/u:2
...
Has any output been changed, is this just a missenterpetation done by powertop?

CPU: AMD Phenom(tm) II X6 1090T Processor

> J
>
>


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