From: Thomas Charbonnel <thomas@undata.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, "K.R. Foley" <kr@cybsft.com>,
Felipe Alfaro Solana <lkml@felipe-alfaro.com>,
Daniel Schmitt <pnambic@unu.nu>,
Lee Revell <rlrevell@joe-job.com>,
Mark_H_Johnson@raytheon.com
Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q9
Date: Thu, 02 Sep 2004 16:38:33 +0200 [thread overview]
Message-ID: <1094135913.5573.2.camel@localhost> (raw)
In-Reply-To: <20040902132342.GA8677@elte.hu>
Ingo Molnar wrote :
> do you have the NMI watchdog enabled? That could help us debugging this.
> Enabling the APIC/IO_APIC and using nmi_watchdog=1 would be the ideal
> solution - if that doesnt work then nmi_watchdog=2 would be fine too,
> but remove this code from arch/i386/kernel/nmi.c:
>
> if (nmi_watchdog == NMI_LOCAL_APIC)
> nmi_hz = 1;
>
> (otherwise nmi_watchdog=2 would result in one NMI per second, not enough
> to shed light on the above 2.8 msec latency.)
>
> Ingo
nmi_watchdog=1 worked fine.
Here's a trace (there seem to be a counter overflow) :
preemption latency trace v1.0.5 on 2.6.9-rc1-VP-Q9
--------------------------------------------------
latency: 539 us, entries: 38 (38)
-----------------
| task: swapper/0, uid:0 nice:0 policy:0 rt_prio:0
-----------------
=> started at: do_IRQ+0x19/0x190
=> ended at: do_IRQ+0x14a/0x190
=======>
00010000 0.000ms (+0.000ms): do_IRQ (common_interrupt)
00010000 0.000ms (+0.000ms): do_IRQ (default_idle)
00010000 0.000ms (+0.000ms): do_IRQ (<00000000>)
00010001 0.000ms (+0.002ms): mask_and_ack_8259A (do_IRQ)
00010001 0.002ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
00010000 0.002ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
00010000 0.002ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
00010001 0.003ms (+0.005ms): mark_offset_tsc (timer_interrupt)
00010001 0.008ms (+0.000ms): do_timer (timer_interrupt)
00010001 0.008ms (+0.000ms): update_process_times (do_timer)
00010001 0.008ms (+0.000ms): update_one_process (update_process_times)
00010001 0.009ms (+0.000ms): run_local_timers (update_process_times)
00010001 0.009ms (+0.000ms): raise_softirq (update_process_times)
00010001 0.009ms (+0.000ms): scheduler_tick (update_process_times)
00010001 0.009ms (+0.000ms): sched_clock (scheduler_tick)
00010001 0.009ms (+0.000ms): update_wall_time (do_timer)
00010001 0.009ms (+0.000ms): update_wall_time_one_tick
(update_wall_time)
00010001 0.010ms (+0.000ms): generic_note_interrupt (do_IRQ)
00010001 0.010ms (+0.000ms): end_8259A_irq (do_IRQ)
00010001 0.010ms (+0.000ms): enable_8259A_irq (do_IRQ)
00000001 0.011ms (+0.524ms): do_softirq (do_IRQ)
00000001 0.535ms (+0.000ms): do_nmi (mcount)
00010001 0.536ms (+0.000ms): profile_tick (nmi_watchdog_tick)
00010001 0.536ms (+0.000ms): profile_hook (profile_tick)
00010002 0.536ms (+0.000ms): notifier_call_chain (profile_hook)
00010001 0.537ms (+689953.062ms): profile_hit (nmi_watchdog_tick)
00000002 689953.599ms (+1.523ms): sched_clock (activate_task)
00000001 0.537ms (+0.000ms): wake_up_process (do_softirq)
00000001 0.537ms (+0.000ms): try_to_wake_up (wake_up_process)
00000001 0.537ms (+0.000ms): task_rq_lock (try_to_wake_up)
00000002 0.537ms (+0.000ms): activate_task (try_to_wake_up)
00000002 0.538ms (+0.000ms): sched_clock (activate_task)
00000002 0.538ms (+0.000ms): recalc_task_prio (activate_task)
00000002 0.538ms (+0.000ms): effective_prio (recalc_task_prio)
00000002 0.538ms (+0.000ms): enqueue_task (activate_task)
00000001 0.538ms (+0.000ms): preempt_schedule (try_to_wake_up)
00000001 0.539ms (+0.000ms): sub_preempt_count (do_IRQ)
00000001 0.539ms (+0.000ms): update_max_trace (check_preempt_timing)
Thomas
next prev parent reply other threads:[~2004-09-02 14:39 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-30 19:13 [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5 Mark_H_Johnson
2004-08-30 19:21 ` Ingo Molnar
2004-09-01 12:31 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5 - netdev_max_back_log is too small P.O. Gaillard
2004-09-01 13:05 ` Ingo Molnar
2004-09-02 11:24 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q6 - network is no longer smooth P.O. Gaillard
2004-09-02 11:28 ` Ingo Molnar
2004-09-02 15:26 ` P.O. Gaillard
2004-08-31 8:49 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5 Ingo Molnar
2004-09-02 6:33 ` Ingo Molnar
2004-09-02 6:55 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q8 Ingo Molnar
2004-09-02 7:04 ` Lee Revell
2004-09-02 7:15 ` Ingo Molnar
2004-09-02 7:31 ` Lee Revell
2004-09-02 7:46 ` Ingo Molnar
2004-09-03 1:10 ` Rusty Russell
2004-09-02 23:25 ` Lee Revell
2004-09-02 23:28 ` Ingo Molnar
2004-09-02 23:32 ` Lee Revell
2004-09-02 7:17 ` Ingo Molnar
2004-09-02 8:23 ` Ingo Molnar
2004-09-02 11:10 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q9 Ingo Molnar
2004-09-02 12:14 ` Thomas Charbonnel
2004-09-02 13:16 ` Thomas Charbonnel
2004-09-02 13:23 ` Ingo Molnar
2004-09-02 14:38 ` Thomas Charbonnel [this message]
2004-09-02 21:57 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R0 Ingo Molnar
2004-09-02 22:06 ` Lee Revell
2004-09-02 22:14 ` Ingo Molnar
2004-09-02 22:15 ` Lee Revell
2004-09-03 0:24 ` Lee Revell
2004-09-03 3:17 ` Eric St-Laurent
2004-09-03 6:26 ` Lee Revell
2004-09-03 6:36 ` Ingo Molnar
2004-09-03 6:49 ` Lee Revell
2004-09-03 7:01 ` Ingo Molnar
2004-09-03 7:05 ` Ingo Molnar
2004-09-03 7:40 ` Lee Revell
2004-09-03 7:50 ` Free Ekanayaka
2004-09-03 8:05 ` Lee Revell
2004-09-03 9:05 ` Free Ekanayaka
2004-09-03 9:25 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R1 Ingo Molnar
2004-09-03 9:50 ` Luke Yelavich
2004-09-03 10:29 ` Ingo Molnar
2004-09-03 10:43 ` Luke Yelavich
2004-09-03 11:33 ` Thomas Charbonnel
2004-09-03 11:49 ` Ingo Molnar
2004-09-03 12:05 ` Thomas Charbonnel
2004-09-03 16:14 ` Thomas Charbonnel
2004-09-03 17:36 ` Thomas Charbonnel
2004-09-03 11:36 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R2 Ingo Molnar
2004-09-03 8:09 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R0 Luke Yelavich
2004-09-03 8:13 ` Lee Revell
2004-09-03 8:21 ` Luke Yelavich
2004-09-03 12:52 ` Luke Yelavich
2004-09-03 18:09 ` K.R. Foley
2004-09-03 11:04 ` K.R. Foley
2004-09-03 17:02 ` K.R. Foley
2004-09-03 20:40 ` Lee Revell
2004-09-03 17:10 ` K.R. Foley
2004-09-03 18:17 ` Ingo Molnar
2004-09-03 18:36 ` K.R. Foley
2004-09-03 19:30 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R3 Ingo Molnar
2004-09-03 19:49 ` K.R. Foley
2004-09-04 3:39 ` K.R. Foley
2004-09-04 3:43 ` K.R. Foley
2004-09-04 6:41 ` Ingo Molnar
2004-09-04 12:28 ` K.R. Foley
2004-09-04 8:57 ` Ingo Molnar
2004-09-04 10:16 ` Lee Revell
2004-09-04 14:35 ` K.R. Foley
2004-09-04 20:05 ` Ingo Molnar
2004-09-03 18:39 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R0 Ingo Molnar
2004-09-03 18:41 ` K.R. Foley
-- strict thread matches above, loose matches on Subject: below --
2004-09-02 20:21 [patch] voluntary-preempt-2.6.9-rc1-bk4-Q9 Mark_H_Johnson
2004-09-02 20:38 ` Ingo Molnar
2004-09-02 22:43 ` Ingo Molnar
2004-09-03 9:09 ` Ingo Molnar
2004-09-03 13:42 Mark_H_Johnson
2004-09-03 15:33 Mark_H_Johnson
2004-09-04 0:04 ` Lee Revell
2004-09-04 16:52 ` Alan Cox
2004-09-04 18:05 ` Lee Revell
2004-09-03 18:28 Mark_H_Johnson
2004-09-03 18:33 ` Ingo Molnar
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