Howto switch system/CPU states?

Howto switch system/CPU states?

[Happy Camper]

I am using 2.4.20-pre10-ac1 and an older ACPI patch for that kernel.
Things comiled fine and my processor looks like it always comes up in C2
state.

$ cat /proc/acpi/processor/CPU/power 
active state:            C2
default state:           C1
bus master activity:     ffffffff
states:
    C1:                  promotion[C2] demotion[--] latency[000]
usage[00046380]
   *C2:                  promotion[C3] demotion[C1] latency[001]
usage[01642565]
    C3:                  promotion[--] demotion[C2] latency[065]
usage[00002290]

I am trying to use some very basic ACPI features with my Linux system but
have not been able to.  Things on my wish list:

1. Suspend the system.  I have tried echo 1 > /proc/acpi/sleep and it
locks up one of my systems while my Thinkpad tries to crash and screen
goes half blank and then hitting the power button brings it back (without
a reboot) with this error:
hwsleep-0239 [09] Acpi_enter_sleep_state: Entering S1
acpi_bus-0263 [21] acpi_bus_get_device   : Error getting context for
object [c1a921c8]

2. Switch CPU C states.  When I load the processor module, I get this
in the /var/log/messages : 
Nov  3 16:09:25 localhost kernel: ACPI: Processor [CPU] (supports C1 C2
C3, 8 throttling states)
However I cant figure out how to switch these processor states.

I have tried pmtest from the pmtools package and it claims to be switching
system states, but the CPU states according to
/proc/acpi/processor/CPU/power
are not changing.

I admit I am newbie at this.  However I have not been able to locate any
current documentation on this stuff.  The Howto at : 
http://www.columbia.edu/~ariel/acpi/acpi_howto.txt
is rather out of date.

I would greatly appreciate any help anybody can provide.

Thanks a million.

Atif

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Re: Howto switch system/CPU states?

[Dominik Brodowski]

On Sun, Nov 03, 2002 at 10:02:00PM -0800, Happy Camper wrote:
> 2. Switch CPU C states.  When I load the processor module, I get this
> in the /var/log/messages : 
> Nov  3 16:09:25 localhost kernel: ACPI: Processor [CPU] (supports C1 C2
> C3, 8 throttling states)
> However I cant figure out how to switch these processor states.

http://www.brodo.de/english/pub/acpi/proc/processor.html

	Dominik


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Re: Howto switch system/CPU states?

[Happy Camper]

Thanks a gazillion.


--- Dominik Brodowski <linux-JhLEnvuH02M@public.gmane.org> wrote:
> On Sun, Nov 03, 2002 at 10:02:00PM -0800, Happy Camper wrote:
> > 2. Switch CPU C states.  When I load the processor module, I get this
> > in the /var/log/messages : 
> > Nov  3 16:09:25 localhost kernel: ACPI: Processor [CPU] (supports C1
> C2
> > C3, 8 throttling states)
> > However I cant figure out how to switch these processor states.
> 
> http://www.brodo.de/english/pub/acpi/proc/processor.html
> 
> 	Dominik
> 
> 
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Re: Howto switch system/CPU states?

[Chris Howells]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

On Monday 04 November 2002 6:57 am, Dominik Brodowski wrote:
> On Sun, Nov 03, 2002 at 10:02:00PM -0800, Happy Camper wrote:
> > 2. Switch CPU C states.  When I load the processor module, I get this
> > in the /var/log/messages :
> > Nov  3 16:09:25 localhost kernel: ACPI: Processor [CPU] (supports C1 C2
> > C3, 8 throttling states)
> > However I cant figure out how to switch these processor states.
>
> http://www.brodo.de/english/pub/acpi/proc/processor.html

In the current ACPI patches (e.g. without the ACPI to cpufreq stuff), does the
switching CPU states have any actual effect?

Thanks


- --
Cheers, Chris Howells -- chris-NvB7AskkBIqIudiWw5vspbVCufUGDwFn@public.gmane.org, howells@kde.org
Web: http://chrishowells.co.uk, PGP key: http://chrishowells.co.uk/pgp.txt
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Re: Howto switch system/CPU states?

[Dominik Brodowski]

On Tue, Nov 05, 2002 at 01:29:01AM +0000, Chris Howells wrote:
> 
> Hi,
> 
> On Monday 04 November 2002 6:57 am, Dominik Brodowski wrote:
> > On Sun, Nov 03, 2002 at 10:02:00PM -0800, Happy Camper wrote:
> > > 2. Switch CPU C states.  When I load the processor module, I get this
> > > in the /var/log/messages :
> > > Nov  3 16:09:25 localhost kernel: ACPI: Processor [CPU] (supports C1 C2
> > > C3, 8 throttling states)
> > > However I cant figure out how to switch these processor states.
> >
> > http://www.brodo.de/english/pub/acpi/proc/processor.html
> 
> In the current ACPI patches (e.g. without the ACPI to cpufreq stuff), does the
> switching CPU states have any actual effect?

Yes, it should. Although you don't know whether it works until you have
tested it. cpufreq only offers a cross-architecture interface, device driver
notification, and timer updates (so that delay() loops are correct and
/proc/cpuinfo shows the right frequency).

	Dominik


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RE: Howto switch system/CPU states?

[Grover, Andrew]

> From: Chris Howells [mailto:chris-NvB7AskkBIqIudiWw5vspbVCufUGDwFn@public.gmane.org] 
> > > Nov  3 16:09:25 localhost kernel: ACPI: Processor [CPU] 
> (supports C1 C2
> > > C3, 8 throttling states)
> > > However I cant figure out how to switch these processor states.
> >
> > http://www.brodo.de/english/pub/acpi/proc/processor.html
> 
> In the current ACPI patches (e.g. without the ACPI to cpufreq 
> stuff), does the
> switching CPU states have any actual effect?

You don't want to use throttling states except when the processor overheats.
Your system doesn't have any performance states to speak of.

Regards -- Andy


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