[Beowulf] hpl size problems

Mark Hahn hahn at physics.mcmaster.ca
Wed Sep 28 07:46:59 PDT 2005

> workstations, because of both security and performance.  Things like
> ipchains or ipfilters tend to be "expensive" overhead on all TCP/UDP
> connections, and overhead in parallel computations is anathema.  So one

has anyone actually measured this?  I suspect that the marginal overhead
for iptables is ~1 us, and at least with gigabit, that's almost in the 
noise (say 3%).  I don't think anyone who is satisfied with gigabit 
would care...

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