Hal Rosenstock wrote: > On Thu, 2008-05-29 at 11:19 +0200, Marcel Heinz wrote: >>Dotan Barak wrote: >>>Marcel Heinz wrote: >>> >>>>[low multicast throughput of ~250MB/s with own benchmark tool] >>> >>>1) I know that ib_send_bw supports multicast as well, can you please >>>check that you can reproduce your problem >>>on this benchmark too? >> >>| #bytes #iterations BW peak[MB/sec] BW average[MB/sec] >>| 2048 1000 301.12 247.05 >> >>This is the same result as my own benchmark showed in that scenario. >> >> >>>2) You should expect that multicast messages will be slower than >>>unicast because the HCA/switch treat them in different way >>>(message duplication need to be done if needed). >> >>Yes, but 250MB/s vs. 1100MB/s (UD unicast throughput) seems to be a bit >>too much of overhead, don't you think? > > > Agreed. > > >>Especially if I take into account >>that with my own benchmark, I can get ~950MB/s when I start another >>receiver on the same host as the sender. Note that both of the >>receivers, the local and the remote one, are seeing all packets at that >>rate, so the HCAs and the switch must be able to handle multicast >>packets with this throughput. > > > Perhaps this is a static rate issue. > > What SM is being used ?
It's OpenSM 3.1.7. I had also made some tests with OpensSM 3.2.1, but this didn't change anything. Regards, Marcel _______________________________________________ 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
