From: Mark_H_Johnson@raytheon.com
To: Ingo Molnar <mingo@elte.hu>
Cc: Mark_H_Johnson@raytheon.com, Amit Shah <amit.shah@codito.com>,
Karsten Wiese <annabellesgarden@yahoo.de>,
Bill Huey <bhuey@lnxw.com>, Adam Heath <doogie@debian.org>,
emann@mrv.com, Gunther Persoons <gunther_persoons@spymac.com>,
"K.R. Foley" <kr@cybsft.com>,
linux-kernel@vger.kernel.org,
Florian Schmidt <mista.tapas@gmx.net>,
Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
Lee Revell <rlrevell@joe-job.com>,
Rui Nuno Capela <rncbc@rncbc.org>,
Shane Shrybman <shrybman@aei.ca>,
Esben Nielsen <simlo@phys.au.dk>,
Thomas Gleixner <tglx@linutronix.de>,
Michal Schmidt <xschmi00@stud.feec.vutbr.cz>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-15
Date: Fri, 10 Dec 2004 14:03:44 -0600 [thread overview]
Message-ID: <OF27B09B8B.40A67C86-ON86256F66.006E33A8-86256F66.006E34B3@raytheon.com> (raw)
This time, initial test results on -18PK (PREEMPT_DESKTOP, no IRQ
threading).
Again, results running cpu_delay and collecting user triggered traces.
[1] Similar symptoms where I do not get traces that span CPU's plus
the missing trace symptom.
# ./cpu_delay 0.000100
Delay limit set to 0.00010000 seconds
calibrating loop ....
time diff= 0.503365 or 397326229 loops/sec.
Trace activated with 0.000100 second delay.
Trace triggered with 0.000321 second delay. [not recorded]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000136 second delay. [not recorded]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000139 second delay. [00]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000130 second delay. [not recorded]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000240 second delay. [01]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000104 second delay. [02]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000130 second delay. [03]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000109 second delay. [04]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000109 second delay. [not recorded]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000155 second delay. [not recorded]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000100 second delay. [05]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000105 second delay. [not recorded]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000128 second delay. [06]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000123 second delay. [07]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000100 second delay. [08]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000113 second delay. [not recorded]
Trace activated with 0.000100 second delay.
Trace triggered with 0.000136 second delay. [09]
# chrt -f 1 ./get_ltrace.sh 50
Current Maximum is 4965280, limit will be 50.
Resetting max latency from 4965280 to 50.
No new latency samples at Fri Dec 10 13:42:31 CST 2004.
No new latency samples at Fri Dec 10 13:42:41 CST 2004.
No new latency samples at Fri Dec 10 13:42:51 CST 2004.
No new latency samples at Fri Dec 10 13:43:01 CST 2004.
New trace 0 w/ 139 usec latency.
Resetting max latency from 139 to 50.
No new latency samples at Fri Dec 10 13:43:23 CST 2004.
New trace 1 w/ 241 usec latency.
Resetting max latency from 241 to 50.
No new latency samples at Fri Dec 10 13:43:44 CST 2004.
New trace 2 w/ 103 usec latency.
Resetting max latency from 103 to 50.
New trace 3 w/ 130 usec latency.
Resetting max latency from 130 to 50.
No new latency samples at Fri Dec 10 13:44:17 CST 2004.
No new latency samples at Fri Dec 10 13:44:27 CST 2004.
No new latency samples at Fri Dec 10 13:44:37 CST 2004.
New trace 4 w/ 109 usec latency.
Resetting max latency from 109 to 50.
No new latency samples at Fri Dec 10 13:44:58 CST 2004.
New trace 5 w/ 100 usec latency.
Resetting max latency from 100 to 50.
New trace 6 w/ 128 usec latency.
Resetting max latency from 128 to 50.
New trace 7 w/ 123 usec latency.
Resetting max latency from 123 to 50.
New trace 8 w/ 100 usec latency.
Resetting max latency from 100 to 50.
No new latency samples at Fri Dec 10 13:45:54 CST 2004.
New trace 9 w/ 135 usec latency.
Resetting max latency from 135 to 50.
I don't see a significant difference in failures to record when compared
with -18RT (7 vs. 8).
[2] I get no ksoftirqd activity (as expected).
[3] Long sequences of one CPU only was seen again. Though in looking
at these traces I find several incomplete ones like this:
preemption latency trace v1.1.4 on 2.6.10-rc2-mm3-V0.7.32-18PK
--------------------------------------------------------------------
latency: 139 us, #55/55, CPU#1 | (M:preempt VP:0, KP:1, SP:0 HP:0 #P:2)
-----------------
| task: cpu_delay-3517 (uid:0 nice:0 policy:1 rt_prio:30)
-----------------
=> started at: <00000000>
=> ended at: <00000000>
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
\ / ||||| \ | /
<unknown-0 0d.h1 0µs : do_nmi (default_idle)
<unknown-0 0d.h1 0µs : do_nmi (_raw_spin_lock_irqsave)
<unknown-3517 1d.H2 0µs : do_nmi (default_idle)
<unknown-0 0d.h1 0µs : do_nmi (<00200246>)
<unknown-3517 1d.H2 0µs+: do_nmi ((514))
<unknown-0 0...1 3µs : default_idle (cpu_idle)
<unknown-3517 1d.H2 3µs : do_IRQ (c013a0cc 0 0)
<unknown-3517 1d.H2 3µs : _raw_spin_lock (__do_IRQ)
<unknown-3517 1d.H3 4µs : ack_edge_ioapic_irq (__do_IRQ)
<unknown-3517 1d.H3 4µs : redirect_hardirq (__do_IRQ)
<unknown-3517 1d.H3 5µs : _raw_spin_unlock (__do_IRQ)
<unknown-3517 1d.H2 5µs : handle_IRQ_event (__do_IRQ)
<unknown-3517 1d.H2 5µs : timer_interrupt (handle_IRQ_event)
<unknown-3517 1d.H2 6µs : _raw_spin_lock (timer_interrupt)
<unknown-3517 1d.H3 6µs : mark_offset_tsc (timer_interrupt)
<unknown-3517 1d.H3 7µs : _raw_spin_lock (mark_offset_tsc)
<unknown-3517 1d.H4 7µs+: _raw_spin_lock_irqsave (mark_offset_tsc)
<unknown-3517 1d.H5 13µs : _raw_spin_unlock_irqrestore (mark_offset_tsc)
<unknown-3517 1d.H4 14µs : _raw_spin_unlock (mark_offset_tsc)
<unknown-3517 1d.H3 14µs+: _raw_spin_lock_irqsave (timer_interrupt)
<unknown-3517 1d.H4 18µs : _raw_spin_unlock_irqrestore (timer_interrupt)
<unknown-3517 1d.H3 18µs : do_timer (timer_interrupt)
<unknown-3517 1d.H3 19µs : _raw_spin_unlock (timer_interrupt)
<unknown-3517 1d.H2 19µs : _raw_spin_lock (__do_IRQ)
<unknown-3517 1d.H3 20µs : note_interrupt (__do_IRQ)
<unknown-3517 1d.H3 20µs : end_edge_ioapic_irq (__do_IRQ)
<unknown-3517 1d.H3 21µs : _raw_spin_unlock (__do_IRQ)
<unknown-3517 1d.H2 21µs : irq_exit (do_IRQ)
<unknown-3517 1d.s2 21µs < (0)
<unknown-3517 1..s1 22µs : mod_timer (rt_check_expire)
<unknown-3517 1..s1 23µs : __mod_timer (rt_check_expire)
<unknown-3517 1..s1 23µs : _raw_spin_lock_irqsave (__mod_timer)
<unknown-3517 1d.s2 24µs : _raw_spin_lock (__mod_timer)
<unknown-3517 1d.s3 24µs : internal_add_timer (__mod_timer)
<unknown-3517 1d.s3 25µs : _raw_spin_unlock (__mod_timer)
<unknown-3517 1d.s2 25µs : _raw_spin_unlock_irqrestore (__mod_timer)
<unknown-3517 1..s1 26µs : cond_resched_all (run_timer_softirq)
<unknown-3517 1..s1 26µs : cond_resched_softirq (run_timer_softirq)
<unknown-3517 1..s1 26µs : _raw_spin_lock_irq (run_timer_softirq)
<unknown-3517 1..s1 27µs : _raw_spin_lock_irqsave (run_timer_softirq)
<unknown-3517 1d.s2 28µs : _raw_spin_unlock_irq (run_timer_softirq)
<unknown-3517 1..s1 29µs : __wake_up (run_timer_softirq)
<unknown-3517 1..s1 29µs : _raw_spin_lock_irqsave (__wake_up)
<unknown-3517 1d.s2 29µs : __wake_up_common (__wake_up)
<unknown-3517 1d.s2 30µs : _raw_spin_unlock_irqrestore
(run_timer_softirq)
<unknown-3517 1..s1 30µs : cond_resched_all (___do_softirq)
<unknown-3517 1..s1 30µs : cond_resched_softirq (___do_softirq)
<unknown-3517 1d... 31µs < (0)
<unknown-3517 1d... 32µs+< (0)
<unknown-3517 1.... 35µs > sys_gettimeofday (00000000 00000000 0000007b)
<unknown-3517 1.... 35µs : sys_gettimeofday (sysenter_past_esp)
<unknown-3517 1.... 35µs : user_trace_stop (sys_gettimeofday)
<unknown-3517 1...1 36µs : user_trace_stop (sys_gettimeofday)
<unknown-3517 1...1 36µs : _raw_spin_lock_irqsave (user_trace_stop)
<unknown-3517 1d..2 37µs : _raw_spin_unlock_irqrestore (user_trace_stop)
I assume that since it does not start with user_trace_start (or something
like that) that the missing portion is the first portion.
[4] Not sure if I can make the same comment on -18PK as I did for -18RT
on changing CPU's [since I understand we do not have the opportunity to
do so unless the IRQ's are threaded].
[5] The trace output cosmetic problems are on PREEMPT_DESKTOP as well.
Traces to come shortly in a separate message.
--Mark
next reply other threads:[~2004-12-10 20:06 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-10 20:03 Mark_H_Johnson [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-12-13 23:14 [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-15 Mark_H_Johnson
2004-12-13 20:02 Mark_H_Johnson
2004-12-13 22:39 ` Ingo Molnar
2004-12-13 17:05 Mark_H_Johnson
2004-12-13 22:33 ` Ingo Molnar
2004-12-10 22:06 Mark_H_Johnson
2004-12-10 22:24 ` Ingo Molnar
2004-12-10 21:58 Mark_H_Johnson
2004-12-10 21:54 Mark_H_Johnson
2004-12-10 22:14 ` Ingo Molnar
2004-12-10 21:31 Mark_H_Johnson
2004-12-10 21:54 ` Ingo Molnar
2004-12-10 21:06 Mark_H_Johnson
2004-12-10 21:40 ` Ingo Molnar
2004-12-10 17:49 Mark_H_Johnson
2004-12-10 21:09 ` Ingo Molnar
2004-12-10 21:12 ` Ingo Molnar
2004-12-10 21:24 ` Ingo Molnar
2004-12-13 0:16 ` Fernando Lopez-Lezcano
2004-12-13 6:47 ` Ingo Molnar
2004-12-14 0:46 ` Fernando Lopez-Lezcano
2004-12-14 4:42 ` K.R. Foley
2004-12-14 8:47 ` Rui Nuno Capela
2004-12-14 11:35 ` Ingo Molnar
2004-12-09 21:58 [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6 Mark_H_Johnson
2004-12-09 22:55 ` Ingo Molnar
2004-12-10 10:53 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-15 Ingo Molnar
2004-12-10 14:59 ` Gene Heskett
2004-12-10 15:59 ` Gene Heskett
2004-12-10 19:09 ` Lee Revell
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