What is GAMMA like for stability these days? It's efficiency would be
compelling enough for me to do some testing, at least, were I in this
situation. Going this route would also make switch latency somewhat more
relevant.
a lot more relevant. I wonder whether the gamma idea could be redone with
the kernel's netpoll interface. that's how kernel logging/dumping/debugging
happens - it's a device-independent path for UDP only, and is not intrusive
on the normal network stack. I also wonder where the ~50 us latency actually
comes from, since I don't believe it really scales with cpu speed. for
instance, suppose you used UDP; could you make a faster MPI? if UDP is a
problem (kernel buffering perhaps), then how about using MMAP_RING (via
pcap), perhaps?
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