A Penguin in Purple Clothing

Tuesday September 21, 2004

Debugging sucks (sometimes)

I spent all day trying to figure out this problem. I was trying to redo the threading in the OpenIB IPoIB code to use kthreads instead of a Topspin home grown method. And in fact, I think I almost have it. It is just that there seems to be some weirdness still going on. If my client cannot join the multicast group, it behaves fine. It backs off according to the exponential algorithm and dies properly when the interface is brought down.

My problem seems to stem from when the interface actually works ok. If I try to bring it up and it can join the mulitcast group, it does it in a two stage process. The first stage works fine, it can come up and join the group. It is when it goes to the second part that it fails. It locks up the console. I can log in via ssh on another screen, but the console locks hard. I don't have a fresh enough brain to figure this out tonight. Maybe tomorrow with more coffee, I will be albe to diagnose the problem.

So, goodnight folks, I am s00per frustrated.

(2004-09-21 22:09:50.0) Permalink