John Martin wrote: > Li, Aubrey wrote: >> >> >> PowerTOP should not be the case that causes 100% highest p-state >> residency in idle. We have this bug >> "6818514 Event based CPUPM too easily shifts into high gear" >> >> fixed and putback since build 117 by rev#. 9802. It looks like it >> does not >> fix the problem. > I believe it does, at least for a i7 920 based system: > > OpenSolaris PowerTOP version 1.2 > > C-states (idle power) Avg Residency P-states (frequencies) > C0 (cpu running) (0.6%) 1596 Mhz 100.0% > C1 3.9ms (99.4%) 1729 Mhz 0.0%
Hi, It looks like C-states are disabled in BIOS on this i7-920? You definitely want C-state enabled on i7 for power savings. Regards, Bill > 1862 Mhz 0.0% > 1995 Mhz 0.0% > 2128 Mhz 0.0% > 2261 Mhz 0.0% > 2394 Mhz 0.0% > 2527 Mhz 0.0% > 2660 Mhz 0.0% > 2661 Mhz(turbo) 0.0% > Wakeups-from-idle per second: 2051.5 interval: 5.0s > no ACPI power usage estimate available > > Top causes for wakeups: > 74.6% (1530.5) sched : <xcalls> unix`dtrace_xcall_func > 6.4% (130.7) <kernel> : genunix`cv_wakeup > > > Before the fix for 6818514, this i7 920 system would stay at the highest > P-state frequency. However, even after the fix it is very easy to nudge > the system into the highest P-state and it may take up to a minute of > (apparent) inactivity before it moves back to the lowest P-state. > > > _______________________________________________ > pm-discuss mailing list > pm-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/pm-discuss
