Per powertop, it does, though kstat cpu_info has only shown it running at the
higher speed. Watching powertop, it does seem to switch between pstates often.
Sent from my iPhone
On Mar 29, 2009, at 9:28 AM, John Martin <John.M.Martin at Sun.COM> wrote:
Jason Rhodes wrote:
any other OSes. Maybe Jason
can have a try some linux liveCD like Ubuntu to see
if P-state works. I just want to
make solaris pm competitive to the other OSes. I will
not persist my opinion if there
is a better reason to disable C-state PDC bits by
default.
For what it's worth, I fired up an Ubuntu 8.10 livecd that I had, and it
supported the two CPU speeds on my E7400 just fine. I could even manually
select either speed manually with the Gnome power applet. Cute.
I also upgraded to snv_110, and it appears to work as promised. kstat
cpu_info lists two supported_frequencies_Hz. What's funny, however, is that it
made no difference in power usage. I have the computer hooked up to a
Kill-a-watt, and power consumption at idle is about 110W, both in build 105 and
110, and in Ubuntu as well.
OpenSolaris PowerTOP version 1.1
Cn Avg residency P-states (frequencies)
C0 (cpu running) (15.4%) 1596 Mhz 0.0%
C1 1.4ms (84.6%) 2793 Mhz 100.0%
Wakeups-from-idle per second: 586.4 interval: 5.0s
no ACPI power usage estimate available
Top causes for wakeups:
25.4% (148.9) sched : <cross calls>
25.2% (147.5) <kernel> : genunix`cv_wakeup
17.1% (100.0) <kernel> : genunix`realitexpire
17.1% (100.0) <kernel> : genunix`clock
16.3% ( 95.6) VBoxHeadless : <cross calls>
3.9% ( 22.8) <kernel> : uhci`uhci_handle_root_hub_status_change
1.7% ( 10.0) <kernel> : ata`ghd_timeout
1.3% ( 7.8) <kernel> : ehci`ehci_handle_root_hub_status_change
1.0% ( 6.0) <kernel> : uhci`uhci_cmd_timeout_hdlr
0.8% ( 4.8) <interrupt> : e1000g#2
Does your system ever move to the lower P-state (1596MHz)?
On my Tecra M10 and hand built i7 920, b110 + daily.0327 bfu
it quickly moves the the lowest P-state.
We've had long discussions on other aliases on whether
Penryn/Wolfdale P-state changes amount to any real reduction
in system power.
