On Wednesday 03 November 2010 00:47:41 Auke Kok wrote: > On 11/02/10 07:40, Vitus Jensen wrote: > > Hej! > > > > Since some kernel versions I notice very high wakeup rates during idle ... > > while the reasons for the wakeup stay at reasonable low numbers. In the > > 'powertop -d' output below it's 27463 wakeups/sec but the highest number > > for any reason is 48. How do I find out what causes the wakeups? Sounds like C-states are not entered. or does: cat /proc/interrupts top show anything suspicious? This guy has a similar problem, but it may be another root cause: https://bugzilla.kernel.org/show_bug.cgi?id=12788
~40,000 wakeups/sec after suspend/resume with Tickless kernel; idle=nomwait or max_cstate=1 helps > > They are actually there because the machine is using ~2W more than usual. > > > > My usual kernel is 2.6.27, it's shows ~100 wakeups (X11, Wifi+powersave) > > > > On this 2.6.36 powertop most of the time reports 1.000-200.000 wakeups > > during idle. It may get to 100 (X11, Wifi) or ~50 (no X11, no Wifi), > > seldomly. Hm, could be that the new intel_idle driver is the cause which got introduced to enter sleep states on specific machines lately. If cat /sys/devices/system/cpu/cpuidle/current_driver shows intel_idle, this might help?: intel_idle.max_cstate=0 Be careful that if intel_idle driver is used idle= overrides as mentioned in above bug, won't show any difference. You may want to open a new bug on https://bugzilla.kernel.org and assign it to the ACPI component. Thomas _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
