> Quoting Or Gerlitz <[EMAIL PROTECTED]>: > Subject: Re: [Bug 506] IPoIB IPv4 multicast throughput is poor > > Michael S. Tsirkin wrote: > >>The low throughput is a major issue, though. Shouldn't the IP multicast > >>throughput be similar to the UDP unicast throughput? > > >Is the send side a send only member of multicast group, or full member? > > The join state (full / sendonly nonmember / nonmember)is something > communicated between the ULP through the ib_sa module and the IB SA. > I don't see how the host ib driver becomes aware to it. > > The current ipoib implementation for sendonly joins is to join as full > member but not to attach its UD QP for that group.
I think so too. So what does the test do? Is it a sendonly join? > >If it's a full join, HCA creates extra loopback traffic which > >has then to be discarded, and which might explain performance degradation. > > Can you explain what --is-- the trigger for the "looback channel" > creation? my thinking it should be conditioned on having any QP attached > to this MGID, which does not seem the case in this scenario. That's what I'd expect. -- MST _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
