linux-kernel - Re: Power Saving

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Message-ID: <474232D9.20407@seclark.us>
Date:	Mon, 19 Nov 2007 20:05:29 -0500
From:	Stephen Clark <Stephen.Clark@...lark.us>
To:	Dave Jones <davej@...hat.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Power Saving

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@...er ~]# 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

-- 

"They that give up essential liberty to obtain temporary safety, 
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty 
decreases."  (Thomas Jefferson)



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