Re: High [extra timer interrupt] count in powertop since 2.6.36

[Ian Kumlien]

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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