Messages in this thread | | | Date | Fri, 22 Jul 2005 19:15:10 +0200 | From | Voluspa <> | Subject | Re: 2.6.13-rc3 Battery times at 100/250/1000 Hz = Zero difference |
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On Fri, 22 Jul 2005 16:48:55 +0200 Pavel Machek wrote: [...] .......Jesper Juhl wrote > > Ok, so with an idle machine, different HZ makes no noticeable > > difference, but I'd suspect things would be different if the machine > > was actually doing some work. > > Would be more interresting to see how long it lasts with a light > > load and with a heavy load. > > No, I do not think so. Biggest difference should be on completely idle > machine where ACPI can utilize low power states. > > Can you check that C3 is utilized? Unloading usb modules may be > neccessary...
I've been reading/checking up on this the last four hours since I had a nagging suspicion that the CPU indeed didn't enter a sleep state. With all the abbreviations in the ACPI field (S1, C1, P1 etc) it killed a fair amount of brain cells, but I'd still call faul on this:
from /var/log/kernel [powernow-k8 module loads processor module which says] ACPI: CPU0 (power states: C1[C1])
and catting /proc/acpi/processor/CPU0/power gives active state: C1 max_cstate: C8 bus master activity: 00000000 states: *C1: type[C1] promotion[--] demotion[--] latency[000] usage[02998796]
/sys/module/processor/parameters/max_cstate says 8 /sys/module/processor/parameters/bm_history says 4294967295
So I'm a bit baffled that no C2/C3 turns up. I've done a test-compile with all of ACPI in kernel instead of as modules, but there was no difference.
I'll unload the whole USB-module part and boot without loading them, but will it matter? Please provide more details about how to debug this (very confusing) field.
Mvh Mats Johannesson -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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