> # 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)
<snip>
>    <...>-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)

Maybe your ethernet device is getting in the way.
Do you also get jack dropouts with ethernet chip disabled,
it's Module unloaded?

      Karsten

		
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