PCI-64: how to find
hahn at physics.mcmaster.ca
Mon Feb 25 12:17:16 EST 2002
> > Is there (objective) comparison chart (bandwidth + latency) of
> > Gigabit ethernet vs Myrinet vs Dolphin ?
> It's impossible to get an objective comparaison, there is too many
perhaps to get a complete and comprehensive picture. but I don't see
why some simple but useful metrics can't be had. for instance,
suppose I just want to know the latency for a zero-sized packet between
just two machines. I don't see why CPU/PCI/etc would make much of a
difference here. sure, it's not enough of a picture to start ordering
hardware, but it's a start (and a fundamental number).
for instance, conventional wisdom seems to be that 1000bT doesn't much
improve the ~50-100 uS latency shown by 100bT for tinygrams. does anyone
have good measurements on that, particularly with irq-mitigation turned *off*?
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