Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: nohz and strange sleep latencies | Date | Sun, 25 Nov 2007 00:29:54 +0100 |
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On Saturday, 24 of November 2007, Pavel Machek wrote: > Hi! > > > > > but perhaps somehow we miss this fact and fail to turn off the lapic > > > > clockevents drivers? > > > > > > Ok, I guess I'm lost. If I offline second CPU, I immediately get > > > 1000Hz timer tick... is that expected? > > > > Hmm. No. I have no idea why this is happening. > > > > 34196 total events, 55.083 events/sec > > echo 0 >/sys/devices/system/cpu/cpu1/online > > 36073 total events, 54.679 events/sec > > Digging into process_32|64.c... > > 64: > while (1) { > while (!need_resched()) { > void (*idle)(void); > > if (__get_cpu_var(cpu_idle_state)) > __get_cpu_var(cpu_idle_state) = 0; > > tick_nohz_stop_sched_tick(); > > 32: > while (1) { > tick_nohz_stop_sched_tick(); > while (!need_resched()) { > void (*idle)(void); > > if (__get_cpu_var(cpu_idle_state)) > __get_cpu_var(cpu_idle_state) = 0; > > ...eek? Which one is wrong?
Hm, it looks like you should have quoted more lines ...
In the second case (32), the tick_nohz_stop_sched_tick() seems to be redundant, so I bet it's this one.
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