Lockups with SMP

Mojo B. Nichols mojo.nichols at verizon.net
Fri Jun 27 13:30:04 EDT 2003


Jirka Bohac <jbohac at jikos.cz> writes:

> > I am just wondering if there is any progress on lockups involving SMP
> > machines.
> 
> ...
> 
> > then followed by "hostap_pci: wlan0: resetting card", then nothing.
> 
> This obviously is not just a SMP issue. We have the same problems on
> uniprocessor machines. Some people have more luck with fast computers,
> slower ones (like my P100) seem to suffer more. 
> 
> My explanation to this is, that there is some locking problem (either
> insufficient locking or a deadlock) and, on the fast computer, the first
> of the conflicting events is likely to be finished before it is
> interrupted by the second... ???????
> 

Unless of course you have fast computer with two cpu's in which case
under significant data sending and recieving one cpu clobbers the
other. So the problem is exasperated by having SMP. If I browse the
webserver directly on the box, it will lockup within 5 minutes.
However, if I NAT traffic on my SMP Access point very seldom does it
lock up once a month (???).  I presume the Second cpu is busy
forwarding the traffic.  I only have two cpus. 

> If I can do anything to help solve this issue, I will try - it's a major
> problem for many in our network.


Likewise, if there is anything me and my peasized brain can do to help, I will try. 


Mojo



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