Messages in this thread | | | Date | Tue, 20 Nov 2007 23:52:46 +0100 | From | Ingo Molnar <> | Subject | Re: nohz and strange sleep latencies |
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* Thomas Gleixner <tglx@linutronix.de> wrote:
> On Tue, 20 Nov 2007, Ingo Molnar wrote: > > > > * Pavel Machek <pavel@ucw.cz> wrote: > > > > > > and send us the output? (Enabling CONFIG_TIMER_STATS, > > > > CONFIG_SCHED_DEBUG and CONFIG_SCHEDSTATS would maximize the amount > > > > of information.) > > > > > > This was w/o hpet=disable . Do you want me to test with hpet=disable? > > > > no, this is fine. You've got a hpet clockevents driver and two lapic > > drivers: > > > > Clock Event Device: hpet > > set_next_event: hpet_legacy_next_event > > set_mode: hpet_legacy_set_mode > > event_handler: tick_handle_oneshot_broadcast > > > > Clock Event Device: lapic > > set_next_event: lapic_next_event > > set_mode: lapic_timer_setup > > event_handler: hrtimer_interrupt > > > > Clock Event Device: lapic > > set_next_event: lapic_next_event > > set_mode: lapic_timer_setup > > event_handler: hrtimer_interrupt > > > > to me this has the feeling of lapic breakage in C2 mode. Does it get any > > better if you boot with 'nolapic'? (but that might in turn turn off > > high-res timers and nohz in essence) Thomas, any ideas? > > Hmm, lapic is considered unstable in c2 by default. You have to tell > the kernel that you trust it in C2 on the command line.
yeah, i was wondering about that too. ACPI enumerated them properly at a certain stage:
ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3]) ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])
but perhaps somehow we miss this fact and fail to turn off the lapic clockevents drivers?
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