Talpey, Thomas wrote:Tom,At 11:38 AM 6/5/2006, hbchen wrote: I am HB Chen from LANL not the Helen Chen from SNL. I didn't run out of CPU. It is about 70-80 % of CPU utilization. The IP over Myrinet ( Ethernet emulation) can reach upto 96%-98% bandwidth utilization why not the IPoIB ?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 :-) ) HB Chen [EMAIL PROTECTED] 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. |
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