[openib-general] Question about the IPoIB bandwidth performance ?

[Helen Chen]

Tom,

We are in the process of measuring the CPU utilization on our NFS/RDMA
experiments in contrast with regular the NFS, we also intend to include 
netperf numbers and will keep you posted with our results as soon as 
possible.

Helen

----- original Message -----
>From openib-general-bounces at openib.org Mon Jun  5 09:03:56 2006


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.  

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