[ltp] CPU running ??? but why????

[Henrique de Moraes Holschuh]

On Sat, 07 Jun 2008, Arno Trautmann wrote:
> When it is heating up, powertop gives me something like:
> ---
> Cn                Avg residency       P-states (frequencies)
> C0 (cpu running)        (42.1%)         1.61 Ghz     0.0%
> C1                0.0ms ( 0.0%)         1.60 Ghz     1.4%
> C2                0.0ms ( 8.3%)         1200 Mhz     0.0%
> C3                0.0ms (49.6%)          800 Mhz    98.6%

That's broken.  See that 0.0ms?  Kernel bug for certain.  No CPU should even
manage to heat up when it stays 50% of its time in C3.

> Wakeups-from-idle per second : 16359.3  interval: 5.0s

Yikes, 16k wakeups from second is an extremely high value.  Try a newer
kernel, one of the very nasty recent bugs in either ACPI EC/GPE management
or in the timekeeping code is apparently hitting your box.

Of course, it could be a firmware or hardware bug.  But given the reports
I have seen in linux-acpi, a Linux bug is a LOT more probable.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh