http://bugzilla.kernel.org/show_bug.cgi?id=12304
------- Comment #25 from mprosi...@volny.cz 2009-01-01 14:53 -------
I tried to check how "processor.max_cstate=1" works and found for me quite
interesting thing:
The following results are for low loaded system.
*** Output from PowerTOP for kernel 2.6.28 without any boot par.:
PowerTOP version 1.9 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 1.5%) 2.54 Ghz 3.2%
C1 0.0ms ( 0.0%) 2.54 Ghz 0.0%
C2 9.4ms (98.5%) 1.60 Ghz 1.0%
800 Mhz 95.9%
*** Output from PowerTOP for kernel 2.6.28 with "processor.max_cstate=1" boot
par.:
PowerTOP version 1.9 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (100.0%) 2.54 Ghz 0.8%
C1 0.0ms ( 0.0%) 2.54 Ghz 0.0%
C2 0.0ms ( 0.0%) 1.60 Ghz 0.3%
800 Mhz 98.9%
----------------------------------------
Does that mean that I am not using C1 states at all ?
Outputs from /proc/acpi/processor/CPU0/power follows:
*** Output from PowerTOP for kernel 2.6.28 without any boot par.:
mar...@linux-bs3f:~> cat /proc/acpi/processor/CPU0/power
active state: C0
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 16000 usec
states:
C1: type[C1] promotion[--] demotion[--] latency[001]
usage[00004247] duration[00000000000000000000]
C2: type[C2] promotion[--] demotion[--] latency[057]
usage[00041399] duration[00000000000897622890]
*** Output from PowerTOP for kernel 2.6.28 with "processor.max_cstate=1" boot
par.:
mar...@linux-bs3f:~> cat /proc/acpi/processor/CPU0/power
active state: C0
max_cstate: C1
bus master activity: 00000000
maximum allowed latency: 16000 usec
states:
C1: type[C1] promotion[--] demotion[--] latency[001]
usage[00034937] duration[00000000000000000000]
C2: type[C2] promotion[--] demotion[--] latency[057]
usage[00000000] duration[00000000000000000000]
--
Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug, or are watching someone who is.
------------------------------------------------------------------------------
_______________________________________________
acpi-bugzilla mailing list
acpi-bugzilla@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
