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.
