[ath9k-devel] still same problem

[W. van den Akker <listsrv@wilsoft.nl>]

On Wednesday 21 January 2009, W. van den Akker wrote:
> > So my theory is that I was triggering the same problem using SMP/
> > Hyperthreading, I suspect your system is not a smaller single
> > processor system?  That would at least support that theory.  I think
> > the problem could be a spinlock locking problem in the interrupt
> > handler, or something like that.  I've programmed drivers, wrote a
> > good part of the IVTV driver, and this behavior reminds me of what I
> > saw there at times during development  (it would be stable on UP
> > systems, lock like this on SMP systems).  I have been peeking around
> > in the code some to get familiar with it, but of course may take some
> > time for me to start grasping what is going on to be able to
> > contribute any help myself.  So this is just what I'm thinking, since
> > freezes like this often seem to be something wrong in the interrupt
> > handler for SMP/preemption configured systems.  If you are using SMP,
> > maybe trying it with just one processor enabled would be a good test
> > to see if this is really true there too.
>
> Hil Chris,
>
> This is correct. Its a SMP system with HT. So I think your assumption is
> right. It must be in that direction.
>
> I will try to test it with one CPU disabled.
> I will report back.
>

I have tested with 1 CPU disabled. Running now for about 2 hours without
hangups (I have several connection drops, but it will reconnect).

I have also tested with 2 CPU's and HT-disabled (noht parameter) but that
had no effect.

So SMP looks like the cause of the problem here.

I will be happy to do further testing.

gr,
Willem

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.