Re: rt20 patch question

[Mark Hounschell <markh@compro.net>]

Steven Rostedt wrote:
> 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
> 
> 

If anything this made it worse. I actually got the freezes while just
booting up the emulation. Once up, the same thing though.

>Mark,
>
> as Ingo commented, this is a Hack! not a solution.

Understood.

Mark