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m00dawg
Tux's lil' helper
Joined: 27 Jan 2003
Posts: 145
Location: Texas
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 Posted: Tue Nov 11, 2003 11:27 pm Post subject: ACPI Throttling Works, CPUFreq does not. |
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I have a bit of a weird problem with my Duron-based laptop. I can get ACPI to throttle down the processor by echoing a number to /proc/acpi/processor/throttling and I know it works becuase when I echo 15, top takes up to 30% of my processing power  though I noticed that /proc/cpuinfo never updates the MHz rating.
Also, when I try to load acpi, powernow-k6 or powernow-k7 (in /lib/modules/2.6.0-test9/kernel/arch/i386/cpu/cpufreq) I get an error that says no such device. The other CPUFreq modules seem to load fine although there is no data in /sys/devices/system/cpu/cpu0 - just an empty directory.
Obviously I am using 2.6 so is anyone having a similar problem or can direct me to what might be going on?
Thanks! |
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AlterEgo
Veteran
Joined: 25 Apr 2002
Posts: 1619
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| Posted: Wed Nov 12, 2003 10:01 am Post subject: |
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I observe the same thing. Throttling pobviously works, but
I would like to see same confirmation that this actually does save electricity
If someone has a suggestion for a "power on demand" script, I'd be most interested! |
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m00dawg
Tux's lil' helper
Joined: 27 Jan 2003
Posts: 145
Location: Texas
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| Posted: Wed Nov 12, 2003 12:46 pm Post subject: |
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| AlterEgo wrote: | I observe the same thing. Throttling pobviously works, but
I would like to see same confirmation that this actually does save electricity
If someone has a suggestion for a "power on demand" script, I'd be most interested! |
Well, I know it saves some power because it helps keep the fan turned off if you set the state to a high enough value (I go all the way to 15 when all I want to do is ssh). There is, however, a "power on demand" script floating around that I saw when trying to search for this thing on Google. I put in something like:
latop throttling linux 2.6
and it was one of the links. A fairly cool idea as checks your processor use percentage and then if there is little activity it begins to throttle things down and visa versa.
I was going to write a script that just lets me select the state I wanted to use and adjust it manually, but I first want to see how much lowing the clock speed improves my battery performance. |
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Kernel & Hardware
