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SubjectRe: 2.6.33 & 2.6.34-rc6: Huge number of Load Balancing tick wakeups.
Hi Len.

On 09/05/10 05:16, Len Brown wrote:
> (linux-pm cc'd)
>
>> I'm seeing a huge number of load balancing tick wakeups, with both 2.6.33 and
>> current git (f1c448e0a9e99c76f4ece368714fb35a40a8daba).
>>
>> This has been reported as a bug in some distros:
>>
>> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521944
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/524281
>
> Unclear if your sighting is the same as those two.
>
> What do you see if vmware is not present?

I still see a huge number, just not as huge. The number of load
balancing ticks seems to increase with the number of ticks from other
sources. Without vmware running I got:

Cn Avg residency
C0 (cpu running) (14.5%)
polling 0.2ms ( 0.0%)
C1 mwait 0.0ms ( 0.0%)
C2 mwait 0.1ms ( 1.7%)
C4 mwait 1.1ms (83.8%)
P-states (frequencies)
Turbo Mode 1.2%
2.21 Ghz 0.0%
1.60 Ghz 0.0%
1200 Mhz 0.1%
800 Mhz 98.7%
Wakeups-from-idle per second : 907.4 interval: 15.0s
no ACPI power usage estimate available
Top causes for wakeups:
42.1% (435.6) [kernel scheduler] Load balancing tick
21.2% (219.6) [extra timer interrupt]
10.2% (105.6) plugin-containe
9.5% ( 98.1) pulseaudio
1.7% ( 17.9) [Rescheduling interrupts] <kernel IPI>
1.7% ( 17.1) [iwl3945] <interrupt>
1.4% ( 14.8) [kernel core] hrtimer_start (tick_sched_timer)
1.4% ( 14.3) [ata_piix] <interrupt>

> What do you see if you boot single user mode,
> how about with maxcpusx=1?

I'll try those later today and get back to you with more info.

Regards,

Nigel

> cheers,
> Len Brown, Intel Open Source Technology Center
>
>> PowerTOP 1.12 (C) 2007, 2008 Intel Corporation
>>
>> Collecting data for 15 seconds
>>
>>
>> Your CPU supports the following C-states : C1 C2 C3 C4
>> Your BIOS reports the following C-states : C1 C2 C4
>> Cn Avg residency
>> C0 (cpu running) (40.8%)
>> polling 0.7ms ( 0.1%)
>> C1 mwait 0.0ms ( 0.0%)
>> C2 mwait 0.1ms ( 3.2%)
>> C4 mwait 0.4ms (56.0%)
>> P-states (frequencies)
>> Turbo Mode 7.3%
>> 2.21 Ghz 0.7%
>> 1.60 Ghz 0.8%
>> 1200 Mhz 0.9%
>> 800 Mhz 90.3%
>> Wakeups-from-idle per second : 1727.3 interval: 15.0s
>> no ACPI power usage estimate available
>> Top causes for wakeups:
>> 53.0% (1983.1) [kernel scheduler] Load balancing tick
>> 27.7% (1035.1) vmware-vmx
>> 8.8% (330.6) [extra timer interrupt]
>> 2.3% ( 85.5) [TLB shootdowns]<kernel IPI>


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