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SubjectRe: [PATCH] clocksource: Load the ACPI PM clocksource asynchronously
Date
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On Sun, 8 Apr 2012 19:20:22 -0700, Arjan van de Ven wrote:

>> to which I bisected as the culprit for very strange load balance
>> behavior on my machine.
>>
>> With this patch in place, my CPU is constantly being pegged at 100%
>> (and my CPU monitor sometimes registers NaN%), regardless of the
>> active governor and under conditions when my computer would normally
>> be idling quite placidly.
>>
>> Reverting this commit does indeed remove the problem from previously
>> problematic builds.
>>
>>
> any chance of a dmesg? (or even better, a diff of the dmesg from
> abefore and fter)

Doh! I should have thought of that.

The dmesg output for a kernel built from your patch's commit yields
this interesting line:

PM-Timer running at invalid rate: 113% of normal - aborting.

That certainly sounds unsavory!

Here is some other, probably uninteresting context:

--- good-dmesg.txt
+++ bad-dmesg.txt
[...]
Initializing cgroup subsys cpu
-Linux version 3.3.0-rc1-good-12d6d41276def096cb3f7dc36f438db9ed6a0a8d+ [...]
+Linux version 3.3.0-rc1-bad-b519508298e0292e1771eecf14aaf67755adc39d+ [...]
[...]
Fast TSC calibration using PIT
-Detected 798.093 MHz processor.
+Detected 798.071 MHz processor.
-Calibrating delay loop (skipped), value calculated using timer frequency.. 1596.18 BogoMIPS (lpj=798093)
+Calibrating delay loop (skipped), value calculated using timer frequency.. 1596.14 BogoMIPS (lpj=798071)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
Initializing cgroup subsys cpuacct
[...]
system 00:0c: Plug and Play ACPI device, IDs PNP0c01 (active)
pnp: PnP ACPI: found 13 devices
ACPI: ACPI bus type pnp unregistered
-Switching to clocksource acpi_pm
[...]
+PM-Timer running at invalid rate: 113% of normal - aborting.

Sincerely,
Michael Witten

P.S.

I'm terribly sorry for the delayed reply; Gmail somehow managed to
throw away this thread entirely (actually, I probably threw it away,
but I'm content to blame my tools; after all, they can't deny it!).


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