[Bug 8243] Problem with Throttling and CPU power state

[Bug 8243] Problem with Throttling and CPU power state

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8243

akpm@osdl.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |akpm@osdl.org



------- Additional Comments From akpm@osdl.org  2007-03-21 01:07 -------
You claim that this bug was present in 2.6.20.3 and that it was not present in
2.6.20.3.

Please clarify?

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[Bug 8243] Problem with Throttling and CPU power state

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8243





------- Additional Comments From akolisek@linuxx.hyperlinx.cz  2007-03-21 01:28 -------
Sorry, bug is present in 2.6.20.X (my current kernel is 2.6.20.3, this bug is
present in 2.6.20.3 too).

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[Bug 8243] Problem with Throttling and CPU power state

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8243





------- Additional Comments From akpm@osdl.org  2007-03-21 09:22 -------
OK.  And are you able to identify the most recent kernel which did not have this
bug?  So we can work out when it was introduced?

Thanks.

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[Bug 8243] Problem with Throttling and CPU power state

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8243


bunk@stusta.de changed:

           What    |Removed                     |Added
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                 CC|                            |bunk@stusta.de
             Status|NEW                         |REJECTED
         Resolution|                            |INSUFFICIENT_DATA




------- Comment #4 from bunk@stusta.de  2007-07-13 20:47 -------
Please reopen this bug if:
- it is still present with kernel 2.6.22 and
- you can provide the requested information.


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[Bug 8243] Problem with Throttling and CPU power state

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8243


akolisek@linuxx.hyperlinx.cz changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REJECTED                    |REOPENED
         Resolution|INSUFFICIENT_DATA           |




------- Comment #5 from akolisek@linuxx.hyperlinx.cz  2007-08-27 12:46 -------
This bug is present in kernel 2.6.22(.1,2,3,4,5) too :(


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Re: [Bug 8243] Problem with Throttling and CPU power state

[Andrew Morton]

On Mon, 27 Aug 2007 12:46:33 -0700 (PDT)
bugme-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8243

This is presently assigned to cpufreq@www.linux.org.uk.  Should it
be assigned to acpi instead?

Thanks.

[Bug 8243] Problem with Throttling and CPU power state

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8243


davej@codemonkey.org.uk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|cpufreq                     |Power-Processor
            Product|Power Management            |ACPI




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Re: [Bug 8243] Problem with Throttling and CPU power state

[Dave Jones]

On Mon, Aug 27, 2007 at 01:01:46PM -0700, Andrew Morton wrote:
 > On Mon, 27 Aug 2007 12:46:33 -0700 (PDT)
 > bugme-daemon@bugzilla.kernel.org wrote:
 > 
 > > http://bugzilla.kernel.org/show_bug.cgi?id=8243
 > 
 > This is presently assigned to cpufreq@www.linux.org.uk.  Should it
 > be assigned to acpi instead?

Yes. cpufreq does nothing with c states.

	Dave

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[Bug 8243] Problem with Throttling and CPU power state

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=8243


davej@codemonkey.org.uk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|cpufreq@www.linux.org.uk    |acpi_power-processor@kernel-
                   |                            |bugs.osdl.org
             Status|REOPENED                    |NEW




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Re: [Bug 8243] Problem with Throttling and CPU power state

[Rafał Bilski]

> This bug is present in kernel 2.6.22(.1,2,3,4,5) too :(
I don't get it. Where is the bug?
> Why my CPU is not in C1 state, when works on 100%? And where is C0 state?
C0 means that CPU is working so it isn't listed.
I think that You have misunderstood this file. It isn't printing current 
CPU state. It is listing all available sleep states in order from 
low latency and higher power consumption to high latency and lower power 
consumption. Star means state that will be used when CPU become idle. 
"Latency" means time needed to enter sleep state and time needed to wakeup 
when something will happen (interrupt or BM DMA for example). So it is 
perfectly OK to use C4 when there it isn't much to do and C2 when CPU is 
spending less time sleeping.
Kernel compilation isn't causing 100% CPU usage. Processor is sleeping 
during I/O wait. Well, unless You are using -j2 or higher.
> state T4 is activated, but only a few seconds and then it goes back to T0. Is
> this ok?
Yes. BIOS option "use throttling to rescue CPU when it is overheating" 
interfering.

Regards
Rafa³

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