At 11:38 AM 6/5/2006, hbchen wrote: >Even with this IB-4X = 8Gb/sec = 1024 MB/sec the IPoIB bandwidth utilization >is still very low. >>> IPoIB=420MB/sec >>> bandwidth utilization= 420/1024 = 41.01%
Helen, have you measured the CPU utilizations during these runs? Perhaps you are out of CPU. Outrageous opinion follows. Frankly, an IB HCA running Ethernet emulation is approximately the world's worst 10GbE adapter (not to put too fine of a point on it :-) ) There is no hardware checksumming, nor large-send offloading, both of which force overhead onto software. And, as you just discovered it isn't even 10Gb! In general, network emulation layers are always going to perform more poorly than native implementations. But this is only a generality learned from years of experience with them. Tom. _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
