Re: Power Saving

Stephen Clark
2007-11-20T01:05:40Z

Dave Jones wrote:

>On Mon, Nov 19, 2007 at 07:41:31PM -0500, Stephen Clark wrote:
> > Hello List,
> >
> > I am trying to get throttling to work on the following processor
>
>I think by throttling, you actually mean changing frequency/voltage ?
>(throttling is something else, where the CPU skips every n cycles,
> which doesn't actually save any power)
>
> > with linux 2.6.17-1.2142_FC4 with no luck.
>
>wow. that's a prehistoric kernel.
>
> > AMD Athlon(tm) XP 1700+
>
>you lose. Only the mobile athlons supported scaling their speed.
>And even then, only if the BIOS supported it with the correct tables.
>(Typically this means, "only laptops").
>
> Dave
>
>
>
well what about the info from /proc/

cat /proc/acpi/processor/CPU0/info
processor id: 0
acpi id: 0
bus mastering control: no
power management: yes
throttling control: yes
limit interface: yes

and:
cat /proc/acpi/processor/CPU0/throttling
state count: 2
active state: T0
states:
*T0: 00%
T1: 50%

and:
[root@joker ~]# cat /proc/acpi/processor/CPU0/power
active state: C2
max_cstate: C8
bus master activity: d18324c9
states:
C1: type[C1] promotion[C2] demotion[--]
latency[000] usage[01340140]
*C2: type[C2] promotion[--] demotion[C1]
latency[090] usage[02980043]

????
Steve

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