Re: 2.6.13-rc3 Battery times at 100/250/1000 Hz = Zero difference

From: Vojtech Pavlik
Date: Tue Jul 26 2005 - 08:17:53 EST

On Thu, Jul 21, 2005 at 08:04:48PM +0200, Voluspa wrote:
> I'd gladly (ehum..) redo this mind-numbingly boring test if someone can
> point me to a magic software which unleashes some untapped powersaving
> feature of the CPU.
> _Kernel 2.6.13-rc3 Boot to Death_:
> 2h48m at 100 HZ
> 2h48m at 250 HZ
> 2h47m at 1000 HZ

Is USB loaded? It'll do 1000 interrupts per second if it is. I'm not sure if
this still is the case on 2.6.13-rc3, please check your /proc/interrupts
to see the rate at which interrupt counters are increasing.

> Acer Aspire 1520 (1524) WLMi, AMD Athlon 64 3400+ (socket 754 according
> to dmidecode-2.6). L1 64K/64K, L2 1024K, 512MB DDR RAM. Manufacturing
> date 18 March 2005. Bought 20 May 2005. Battery used to full drain ca 5
> times prior to this test (after the initial 3 charge/drains to reach its
> full potential). "cat /proc/acpi/battery/BAT0/info":

This almost looks like a regular Athlon 64, not even the mobile version.
I wouldn't expect very big deep sleep capabilities on that one. You can
check the


file for the list of C states. A normal Athlon64 will likely have only
C0. Mobile chips can go up to C4, which is really deep sleep.

Vojtech Pavlik
SuSE Labs, SuSE CR
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