http://bugzilla.kernel.org/show_bug.cgi?id=8229
Summary: Problem with CPU throttling and power states
Kernel Version: 2.6.20.3
Status: NEW
Severity: normal
Owner: [EMAIL PROTECTED]
Submitter: [EMAIL PROTECTED]
Most recent kernel where this bug did *NOT* occur: 2.6.20.3
Distribution: Slackware 11.0
Problem Description:
Hi,
i have some problems with CPU Throttling and power states of my CPU.
I get this report...CPU rest
cat /proc/acpi/processor/CPU0/power
active state: C4
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 2000 usec
states:
C1: type[C1] promotion[C2] demotion[--] latency[001]
usage[00000010] duration[00000000000000000000]
C2: type[C2] promotion[C3] demotion[C1] latency[001]
usage[00502851] duration[00000000000275479975]
C3: type[C3] promotion[C4] demotion[C2] latency[085]
usage[00000431] duration[00000000000001178354]
*C4: type[C3] promotion[--] demotion[C3] latency[185]
usage[00053417] duration[00000000000142463775]
It should be ok...but...
when i start...for example...kernel compilation...state of my busy CPU is this:
active state: C2
max_cstate: C8
bus master activity: 80000001
maximum allowed latency: 2000 usec
states:
C1: type[C1] promotion[C2] demotion[--] latency[001]
usage[00000010] duration[00000000000000000000]
*C2: type[C2] promotion[C3] demotion[C1] latency[001]
usage[00576754] duration[00000000000315228566]
C3: type[C3] promotion[C4] demotion[C2] latency[085]
usage[00004034] duration[00000000000009452622]
C4: type[C3] promotion[--] demotion[C3] latency[185]
usage[00099626] duration[00000000000262585789]
My question is this:
Why my CPU is not in C1 state, when works on 100%? And where is C0 state?
I have problems with Throttling function too.
my command: echo -n 4 > /proc/acpi/processor/CPU0/throttling
state T4 is activated, but only a few seconds and then it goes back to T0. Is
this ok?
I heard, that Throttling is active only in C0 state.
my CPU power management:
CPU Frequency scaling
ondemand gowernor
ACPI Processor P-State driver
Intel Enhanced SpeedStep
Hardware Environment: Lenovo 3000 C100 (Pentiom M 1.7GHz Dothan)
Software Environment: Slackware Linux 11.0
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