Re: rt20 patch question

[Steven Rostedt]

On Fri, 12 May 2006, Mark Hounschell wrote:

> Ingo Molnar wrote:
> >
> > Mark, does this fix the problem?
> >
> > 	Ingo
> >
[...]
>
> It looks like it does fix at least the BUG and network disconnection
> problem I am/was seeing. It's been 45 minutes or so without a glitch.
>
> I'm still not running this in complete preempt mode. Should I see if it
> helps that situation also? It only took a few minutes for that one to
> show up.
>


I was looking at the logdump, but I don't see anything spinning.  CPU 1
seems to be constantly running your v67 program (alternating with
posix_cpu_timer), and CPU: 0 is still switching with the swapper, along
with other tasks, so that this means nothing is just spinning and hogging
the CPU (on CPU 0, but I assume the v67 tasks is suppose to keep running).

But, this could mean that something is blocked on a lock, or missed a
wakeup somewhere and we block X from responding. Although X is shown up,
but some signal to do an event my be prevented.

I wonder if the fact that softirqs are running with preemption enabled, is
the problem here.

Could you try the patch that Ingo sent here:

http://marc.theaimsgroup.com/?l=linux-kernel&m=114741312301909&q=raw

-- Steve

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