Re: acpi_processor.c - kernel 2.6.1

[christian graf <chr.graf-Mmb7MZpHnFY@public.gmane.org>]

Hi Bruno,

I thought for full performance the C1 state is better as the C2 (which
keeps good performance as well as powersavings)? Or why do you prefer
C2?

How can I avoid the bios - trouble?

christian

 
Am So, den 18.01.2004 schrieb Ducrot Bruno um 03:58:
> On Sun, Jan 18, 2004 at 12:43:13AM +0100, christian graf wrote:
> > Hi,
> > 
> > reading the /usr/src/linux-2.6.1/drivers/acpi/processor.c
> > i thought the kernel should set the state dynamically, based on the
> > load. Maybe it is possible to set the processor-state of my centrino
> > manually. Can please anybody tell me how to get it right?
> > 
> > The reason I'm asking is, that once I do load the processor.ko module,
> > my Centrino switches immediately into C2-state. It never switches back
> > to C1 state, even under heavy load like compiling the kernel.
> > 
> > I think the kernel should switch back from C2 to C1 state from alone????
> > 
> > Please ask me whatever you need to help me swtiching back into C1 state.
> > 
> > christian
> > 
> > 
> > 
> > cat /proc/acpi/processor/CPU0/power
> > active state:            C2
> > default state:           C1
> > bus master activity:     ffffffff
> > states:
> >     C1:                  promotion[C2] demotion[--] latency[000]
> > usage[00000010]
> >    *C2:                  promotion[C3] demotion[C1] latency[001]
> > usage[00905291]
> >     C3:                  promotion[--] demotion[C2] latency[185]
> > usage[00000000]
> > 
> 
> The latency for C2 is too low (and therefore it is a BIOS trouble).
> Anyway, C2 is better than C1, so you want C2 ;)
> 
> Note that there is some missing code in the processor.c stuff, which may
> give you more appropriate latency, and a C4 state.  The code for is under
> developpement.



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