On Thursday 29 September 2005 21:25, Hal Rosenstock wrote:
> In the log, I do see several nodes successfully join the IPoIB broadcast
> group and the multicast tree for this got setup (I didn't actually
> validate the tree itself).
>
> PortGid.................0xfe80000000000000 : 0x0002c90200001575
> PortGid.................0xfe80000000000000 : 0x0002c90200001581
>
> What is your switch configuration ? It looks like a single switch. Is
> that right ?

Yes, it's a single MTS-2400 with 24 ports. 

Maybe a switch firmware problem? We once observed a complete switch lockup 
that shut down all communication.

> Bottom line, I still can't see anything wrong. You may need to turn on
> IPoIB multicast debug in the host stack to see what is not working
> correctly.

Which means building yet another kernel, because there is no debugfs in 2.6.9, 
so IPoIB debugging doesn't work there...

- Thomas

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