[ofa-general] Limited number of multicasts groups that can be joined?

[Sean Hefty]

> Also some newer results.  I had a long run going on the 128 node machine 
> to see how many groups I really could join, and it just errored out 
> after joining 892 groups successfully.  Specifically, I got an 
> RDMA_CM_EVENT_MULTICAST_ERROR event containing status -22 ('Unknown 
> error' according to sterror).  errno is still cleared to 'Success'.  I 
> don't have time go look at the code to see where this came from right 
> now, but does anyone know what it means?

This is EINVAL and is coming from the librdmacm.  That doesn't really 
help narrow down what the actual cause is unfortunately.  And I don't 
understand the behavior that you're seeing at all.

- Sean