On 7/16/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
First, I noticed that my CPU consumes considerably more power (an extra 0.5W) when running at the lowest speed (1.00GHz) as opposed to when it runs at its native speed (2.16GHz); it may be a hardware flaw (ACPI?) or anything else, I don't know.
What driver do you use to modify the clock? If its clock-modulation, its not good for power consumption (only for thermal emergency), afaik.
I wonder whether cpufreq, in as cool and sexy as it is, does make any sense at all (given the fact that it does introduce some overhead). For me, it seems that it doesn't (even when I adjust the minimum frequency so as to avoid the 1.00GHz thing described above). My guess here is that a faster clock allows the CPU to do its work quickly, and then sleep longer. I may be wrong, and I would like to know whether other people experience the same situation.
Try the ondemand governor. It should make the CPU go max speed, do the work fast, then go back to low-speed&sleep state. The cpuidle patch should also help make better use of C-states.
An idle kernel, for me, produces (still in runlevel 1) just ~1 wakeup/second (with C3 residency times of ~850-1000ms).
That should be good enough ;)
The next steps will be to identify userspace code that
Try some other hardware tweaks, such as backlight, tv-out-disable, etc. --Edwin _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
