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| 16:11.21 | aledge | hi, is there a way to verify that my system is idling properly? It doesn't look like I can step my g5's clock down too much with cpufreq, so I at least want to make sure it idles. when I cat /proc/cpuinfo, though, it's always at least 1.8GHz. |
| 16:35.31 | aledge | join #ppclinux |
| 16:48.01 | pahartik | aledge: If CPU frequency can be controlled by kernel, it shows up in "/sys/devices/system/cpu/cpu0/cpufreq/" |
| 16:48.35 | aledge | I understand that, but I was just wondering about cpuidle |
| 16:48.45 | aledge | since it seems like my machine can only step from 2.0GHz to 1.8GHz |
| 16:49.28 | aledge | i mostly want to make sure that it's running properly. |
| 16:49.50 | pahartik | aledge: If some sort of idle instruction is supported by CPU, Linux kernel uses it by default |
| 16:49.57 | aledge | ok |
| 16:50.33 | aledge | i noticed that there are two (I think?) cpuidle governors, and it seems like there should be a way to switch them. but maybe that is done by the kernel? |
| 16:54.41 | pahartik | aledge: "ondemand" and "conservative" are supposedly automatic, but neither has worked for me on iBook G4... I just use "powersave" and CPU remains at 600 MHz |
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| 16:55.34 | aledge | Right, I am just using powersave, and /proc/cpuinfo says that I'm at 1.8GHz. I just want to test that the system is *idling* properly, not stepping the cpufreq |
| 16:57.00 | aledge | in the source tree are two governors for cpuidle, ladder and menu |
| 17:02.48 | pahartik | aledge: "grep CPU_IDLE /usr/src/linux-source-2.6.32-kiara/arch/*/Kconfig" only points to "sh" and "x86" |
| 17:05.49 | aledge | hm, also I just realized that I'm using 2.6.26 |
| 17:06.06 | aledge | I don't think cpuidle for powerpc was merged intil at least 2.6.3* |
| 17:06.09 | aledge | ugh, sorry |
| 17:09.25 | pahartik | aledge: I assume that most architectures do not need specific instruction to idle when there is nothing to do |
| 17:09.58 | aledge | hm good point, but then i'm not sure what cpuidle actually does |
| 17:10.15 | aledge | the power 70fx has several levels of idling |
| 17:10.17 | aledge | dunno |
| 17:10.28 | aledge | just worried cuz the computer i just got is a beast :) |
| 17:10.32 | aledge | and i plan to leave it on all the time |
| 17:18.30 | pahartik | aledge: Make sure that module "THERM_PM72" is loaded ("Support for thermal management on PowerMac G5", "This driver provides thermostat and fan control for the desktop G5 machines.") |
| 17:21.32 | pahartik | aledge: Actually, there are other modules too, depending on model... Just one is needed |
| 17:52.28 | aledge | alright thanks |
| 17:52.59 | aledge | do you think it would be an issue now if i download the latest stable kernel from kernel.org and ran that without the deb patches? I'm worried debian's patches are too old for it |
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| 17:56.33 | pahartik | aledge: It should not be problem... Debian currently provides "linux-source-2.6.18", "linux-source-2.6.24", "linux-source-2.6.26", "linux-source-2.6.29", "linux-source-2.6.30", "linux-source-2.6.32"... |
| 17:56.45 | aledge | oh ok |
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