On Tue, 18 Nov 2003, Eric Anderson wrote: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:
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%"
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%".
I'll try this tomorrow - anyway to get it to automatically set it to a value when going in to economy mode?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.
He says "hi" :) (small world, eh?)Eric Anderson Systems Administrator Centaur Technology
Say hi to Tom Crispin for me. :)
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
-- ------------------------------------------------------------------ Eric Anderson Systems Administrator Centaur Technology All generalizations are false, including this one. ------------------------------------------------------------------
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