Hi,
Unfortunately the cpu_info's current_clock_Hz "snapshot"
is relatively useless in human time scale. It only shows
the instantaneous p-state at the time of the kstat snapshot.
It is not useful to compute an average over some time period.
Additionally the kstat command itself may cause the CPU's
power domain to momentarily transition to a faster p-state.
The kstat would be usable if it provided a running count
of hrtime spent in each p-state.... ;-)
Regards,
Bill
On 07/26/10 12:56, Andrej Podzimek wrote:
Hello,
So it seems that Lord Kernel is right and I'm wrong:
OpenSolaris PowerTOP version 1.2
C-states (idle power) Avg Residency P-states (frequencies)
C0 (cpu running) (6.1%) 1199 Mhz 93.7%
C1 1.4ms (86.2%) 1333 Mhz 0.0%
C2 1.5ms (6.5%) 1466 Mhz 0.0%
C3 1.5ms (1.2%) 1599 Mhz 0.0%
1733 Mhz 0.0%
1794 Mhz(turbo) 6.3%
I read a couple of blogposts saying that processor states would be
reflected in the output from 'kstat cpu_info'. That's why I got
confused by the fact that those numbers from 'kstat cpu_info' *never*
change. Anyway, powertop explains this. Scaling obviously does work,
although kstat doesn't say so.
Andrej
Hi,
what is powertop saying?
Also, pm-discuss@ is better place for this.
Best regards,
Milan
Andrej Podzimek píše v po 26. 07. 2010 v 06:38 +0200:
Hello,
There seems to be no freuqency scaling on my machine. The
frequencies shown by kstat remain at the highest possible value.
The output from kstat (for the first one of the eight virtual CPUs):
module: cpu_info instance: 0
name: cpu_info0 class: misc
brand Intel(r) Core(tm) i7
CPU Q 820 @ 1.73GHz
cache_id 0
clock_MHz 1733
clog_id 0
core_id 0
cpu_type i386
crtime 41,803748237
current_clock_Hz 1734000000
current_cstate 3
family 6
fpu_type i387 compatible
chip_id 0
implementation x86 (chipid 0x0 GenuineIntel
106E5 family 6 model 30 step 5 clock 1733 MHz)
model 30
ncore_per_chip 4
ncpu_per_chip 8
pg_id 5
pkg_core_id 0
snaptime 61391,9925084
socket_type Unknown
state on-line
state_begin 1280057052
stepping 5
supported_frequencies_Hz
1199000000:1333000000:1466000000:1599000000:1733000000:1734000000
supported_max_cstates 3
vendor_id GenuineIntel
This is in my /etc/power.conf:
autopm default
autoS3 default
cpu-threshold 1s
autoshutdown 30 9:00 9:00 noshutdown
cpupm enable
BTW, the frequency value seems to be the TurboBoost „virtual
frequency“... This is quite surprising, especially when it's shown
for all the eight virtual CPUs at once all the time.
Is this a known issue or have I just forgotten to configure
something? This is a ThinkPad W510 and frequency scaling works just
fine on this machine under Linux.
Andrej
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