Li, Aubrey 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 >> -- >> > > Thanks for your effort. So linux must set all the _PDC bits by default, > without checking if the related feature is supported or not. Now solaris > has the same behavior as linux. Thanks again to let us know this, :) >
So linux doesn't support deep C-states? > >From powertop report, it looks like "cpupm" is not enabled on your box. > Can you check /etc/power.conf if cpupm is enabled? > if not, add the following line to /etc/power.conf and run "pfexec pmconfig". > > "cpupm enable event-mode" > > You should see p-state resident 100% on 1596Mhz when idle. > I agree. Check your cpupm setting. But the high C0 residency might be a factor too. Mark > Thanks, > -Aubrey > _______________________________________________ > pm-discuss mailing list > pm-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/pm-discuss >
