*Huge* amount of wakeups

[hirakendu das]

Its 'cat /proc/interrupts'.

Thanks,
Hirakendu.

Jan Willies <jan at willies.info> wrote: hirakendu das wrote:
> I hope you are not running with idle=poll, because thats meant to kill 
> the cpu ;). It indeed keeps the cpu more or less 100% in C0, and I just 
> wanted to give an example what it means to be almost all the time in C0 
> ;). (In my case, the fans won't stop whining if I give idle=poll and 
> temperature is always above 50C.)

Temperature is always above 50C here.

> I had fiddled with clocksources some time back with no use. First of 
> all, pit apparently only works in single processor. Try see if your 
> kernel has smp (if so, try with smp disabled). I have observed that the 
> system starts with tsc as my clocksource. The moment I enable C2 and C3 
> states (by inserting a cpuidle governor), I get a message that my tsc 
> has been marked unstable and the clocksource is changed to hpet. And 
> 'jiffies' and 'acpi_pm' screw up my time (the system clock goes very 
> slow or fast).

Single core AMD CPU. I haven't experienced the slow/fast system clock 
issue though.

> At the moment, I would really suggest you to try enabling the cpuidle 
> option in the kernel, but without any governors. Atleast in my case, the 
> problem doesn't appear if my cpu doesn't go to C2/C3 at all. With this, 
> powertop will show as if cpu is 100% in C0, but actually, it will be 
> using both C0 and C1 as mentioned earlier. So, you can try this and see 
> if it solves the issue and also whats the power consumption.

Hm. I did that but nothing changed :/ Even without any governor my CPU 
would go for 80000 wakeups/s.

> Btw, some time back at gentoo forums, someone (who also had this high 
> wakeups issue) had suggested that the userspace cpufreq governor isn't 
> that good (btw, his problem also mysteriously disappeared for good, 
> after some arbirtary kernel config changes). So try if changing the 
> cpufreq governor in kernel to performance or ondemand makes those 'tsc 
> unstable' messages to disappear.

I tried ondemand and conservative without luck.

You mentioned something about shared IRQs. Is there a way to test if 
some things are sharing the same IRQ? This is my last hope.

Thanks for your answer and suggestions, very appreciated!


- Jan

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