Userspace: available processorspeeds
Hello,
I'm trying to write a userspace processor-speed governor for my laptop, an Asus L3000D. It has an AMD Athlon Mobile processor and runs on Linux 2.6.0-test5 (and Debian unstable).
For some reason, my laptop crashes when the speed changes from maximum to minimum at once. So my program is to step the speed only to the next level available. This is repeated every 5 seconds, so both the maximum and minimum speed are reachable. The available speeds are printed when the module PowerNow is loaded, but isn't there a 'better' way to retrieve this information? There doesn't seem to be a file listing all possible speeds in either /proc nor /sys. Have I overlooked a file perhaps, or is there some function call I can use?
Besides this, I have experienced the following weirdness: according to /sys/.../scaling_min_freq, my processor's minimum speed is 532 Mhz. I have, however, had it running at 292Mhz (as reported by /proc/cpuinfo). It's not really reproducible unfortunately, and I only noticed it once or twice.The laptops keeps working fine though, so it's not much of a problem to that respect. Any actions I should take the next time I see it?
Regards,
Jeroen van der Vegt.
Quoted 10 lines · Jeroen Van der Vegt
Hello,
I'm trying to write a userspace processor-speed governor for my laptop, an Asus L3000D. It has an AMD Athlon Mobile processor and runs on Linux 2.6.0-test5 (and Debian unstable).
For some reason, my laptop crashes when the speed changes from maximum to minimum at once. So my program is to step the speed only to the next level available. This is repeated every 5 seconds, so both the maximum and minimum speed are reachable.
Please be sure to upgrade to linux-2.6.0-test6 at least, due to some bugs in previous versions in powernow-k7.
Quoted 8 lines
The available speeds are printed when the module PowerNow is loaded, but isn't there a 'better' way to retrieve this information? There doesn't seem to be a file listing all possible speeds in either /proc nor /sys. Have I overlooked a file perhaps, or is there some function call I can use?
Besides this, I have experienced the following weirdness: according to
/sys/.../scaling_min_freq, my processor's minimum speed is 532 Mhz. I have, however, had it running at 292Mhz (as reported by/proc/cpuinfo).
Strange. Perhaps a bug somewhere in core?
Quoted 3 lines
It's not really reproducible unfortunately, and I only noticed it once or twice.The laptops keeps working fine though, so it's not much of a problem to that respect. Any actions I should take the next time I see it?
Look what say bogomips, or x86info --mhz
Cheers,
Signature · 4 lines
Ducrot Bruno -- Which is worse: ignorance or apathy? -- Don't know. Don't care.
Quoted 3 lines · Jeroen Van der Vegt
Besides this, I have experienced the following weirdness: according to
/sys/.../scaling_min_freq, my processor's minimum speed is 532 Mhz. I have, however, had it running at 292Mhz (as reported by/proc/cpuinfo).
The 532 is a calculated speed using FSB speed * a multipler. The 292 is an estimate based upon bogomips calculation at boot time, and also, is subject to thermal throttling by ACPI if present.
Think of '532' as actual speed, and '292' as effective speed.
Dave
Signature · 1 line
Dave Jones http://www.codemonkey.org.uk