Re: 2.6.14-rc3-rt10 - xruns & config questions

[Lee Revell]

On Fri, 2005-10-07 at 10:47 -0700, Mark Knecht wrote:
> On 10/7/05, Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
> > On Fri, 2005-10-07 at 09:44 -0700, Mark Knecht wrote:
> > > Hi Ingo,
> > >    OK, I've been running -rt10 for the last couple of hours on a new
> > > kernel without SMP. No xruns so far at 64/2. I'm doing all the normal
> > > stuff. emerge sync, building some code outside of portage, playing
> > > music. Very good so far, but it will likely take 4-6 hours for me to
> > > be more sure saying it was just SMP latencies.
> >
> > IIRC you posted some traces that implied the migration thread was
> > involved.
> >
> > Lee
> 
> No Lee, I don't think I've posted any traces myself. Possibly someone else?
> 

I was thinking of this trace that Fernando posted on 9/26 in the LKML
thread "jack, PREEMPT_DESKTOP, delayed interrupts?".  Note move_tasks
and load_balance_newidle near the end.  I never saw an explanation of
this:

# cat /proc/latency_trace
preemption latency trace v1.1.5 on 2.6.13-0.3.rdtd.rhfc4.ccrmasmp
--------------------------------------------------------------------
 latency: 10852 us, #70/70, CPU#0 | (M:preempt VP:0, KP:1, SP:1 HP:1
#P:2)
    -----------------
    | task: qjackctl-4797 (uid:743 nice:0 policy:1 rt_prio:61)
    -----------------

                 _------=> CPU#
                / _-----=> irqs-off
               | / _----=> need-resched
               || / _---=> hardirq/softirq
               ||| / _--=> preempt-depth
               |||| /
               |||||     delay
   cmd     pid ||||| time  |   caller
      \   /    |||||   \   |   /
   <...>-4593  1Dnh3    0us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3    0us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3    0us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3    0us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3    0us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3    1us+: SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3    3us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3    3us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3    3us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3    3us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3    3us+: SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3    5us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3    6us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3    6us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3    6us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3    6us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3    6us+: SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3    8us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3    9us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3    9us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3    9us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3    9us+: SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3   11us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   11us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   12us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3   12us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   12us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   12us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   12us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3   12us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   13us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   13us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   13us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   13us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3   13us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   13us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   13us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   13us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3   13us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   14us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   14us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   14us : MacPrivateStat (SkPnmiGetStruct)
   <...>-4593  1Dnh3   14us : MacUpdate (MacPrivateStat)
   <...>-4593  1Dnh3   14us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   14us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   14us+: SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3   17us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   18us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   18us : SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3   20us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   20us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   20us+: SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3   22us : GetStatVal (MacPrivateStat)
   <...>-4593  1Dnh3   22us : GetPhysStatVal (GetStatVal)
   <...>-4593  1Dnh3   22us+: SkGmMacStatistic (GetPhysStatVal)
   <...>-4593  1Dnh3   24us!: MacPrivateStat (SkPnmiGetStruct)
softirq--8     0Dnh4 9901us : trace_change_sched_cpu (1 0 0)
softirq--8     0Dnh4 9901us : _raw_spin_unlock (trace_change_sched_cpu)
softirq--8     0Dnh3 9902us : enqueue_task (move_tasks)
softirq--8     0Dnh3 9902us : resched_task (move_tasks)
softirq--8     0Dnh3 9902us : _raw_spin_unlock (load_balance_newidle)
softirq--8     0Dnh2 9902us : preempt_schedule (_raw_spin_unlock)
   <...>-4797  0Dnh2 9903us : __switch_to (__schedule)
   <...>-4797  0Dnh2 9904us : __schedule <softirq--8> (62 26)
   <...>-4797  0Dnh2 9904us : _raw_spin_unlock_irq (__schedule)
   <...>-4797  0...1 9904us : trace_stop_sched_switched (__schedule)
   <...>-4797  0Dnh1 9905us : _raw_spin_lock (trace_stop_sched_switched)
   <...>-4797  0Dnh2 9905us : trace_stop_sched_switched <<...>-4797> (26
0)
   <...>-4797  0Dnh2 9905us : trace_stop_sched_switched (__schedule)

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