Felix von Leitner wrote:
Thus spake Rick Jones ([email protected]):
Past performance is no guarantee of current correctness :) And over an
Ethernet, there will be a very different set of both timings and TCP
segment sizes compared to loopback.
My guess is that you will find setting the lo mtu to 1500 a very
interesting experiment.
Setting the MTU on lo to 1500 eliminates the problem and gives me double
digit MB/sec throughput.
I'm not in a position at the moment to test it as my IPoIB systems are offline,
and not sure you are either, but I will note that with IPoIB bits circa OFED1.2
the default MTU for IPoIB goes up to 65520 bytes. If indeed the problem you
were seeing was related to sub-mss sends and window probing and such, it might
appear on IPoIB in addition to loopback.
rick jones
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