acpi_cpu_idle panic (Was: Re: kernel panic with todays source)
Eric Anderson
anderson at centtech.com
Wed Nov 19 14:51:21 PST 2003
Nate Lawson wrote:
>On Tue, 18 Nov 2003, Eric Anderson wrote:
>
>
>>Nate Lawson wrote:
>>
>>
>>>cvsup to -current as of today would be a good first start. The code was
>>>committed Nov 15. Then boot with acpi enabled and post the output of
>>>sysctl hw.acpi.cpu. You can try different levels by doing sysctl
>>>hw.acpi.cpu.cx_lowest=x where x is 0...(number_supported_states - 1)
>>>
>>>
>>>
>>Thanks! I've rebuilt and am happy to say that nothing is hosed and I
>>booted successfully :)
>>
>>Here's my sysctl output:
>>$ sysctl hw.acpi.cpu
>>hw.acpi.cpu.max_speed: 8
>>hw.acpi.cpu.current_speed: 4
>>hw.acpi.cpu.performance_speed: 8
>>hw.acpi.cpu.economy_speed: 4
>>
>>
>
>You should run a benchmark with different values for
>hw.acpi.cpu.current_speed to be sure the throttling control still works
>ok. I left it mostly intact so you shouldn't see any problems but it's
>still good to test. As you change it, you should see dmesg output of
>"acpi_cpu0: set speed to xx%"
>
I can change the hw.acpi.cpu.economy_speed value, but the current_speed
is read only. When I set economy speed, it automatically bumps the
current speed down to my economy value (as expected). However, no dmesg
output. The only note I see is when going from AC to battery, I get:
kernel: system power profile changed to 'economy'
and of course going back to aAC shows 'performance' instead of economy.
I never see any "set speed to xx%".
>>hw.acpi.cpu.cx_supported: C1/1 C2/1 C3/85 C3/185
>>hw.acpi.cpu.cx_lowest: 0
>>hw.acpi.cpu.cx_history: 23589/0 0/0 0/0 0/0
>>
>>I played with the different levels a bit, and can't tell much difference
>>in them. Let me know what else I can try to break with this. Just for
>>the info, I booted with a/c plugged in, but did the sysctl running on
>>battery.
>>
>>
>
>You should set hw.acpi.cpu.cx_lowest to 1 regularly and 2 or 3 if you're
>using battery. This will save on heat. I'd also be interested in if
>you'd set it to 3 while on battery and run a typical workload for an hour
>and then send me the result of sysctl hw.acpi.cpu. The cx_history value
>helps me know if my scheduler is accurate.
>
I'll try this tomorrow - anyway to get it to automatically set it to a
value when going in to economy mode?
>>Eric Anderson Systems Administrator Centaur Technology
>>
>>
>
>Say hi to Tom Crispin for me. :)
>
He says "hi" :) (small world, eh?)
On a side note - can I do anything with the "lid control switch" acpi
piece? I'd like to make it turn off the screen and go into a sleep
mode (it goes into sleep, but the screen stays lit up).
Thanks for the great work!
Eric
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Eric Anderson Systems Administrator Centaur Technology
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