Very high wide area TCP tuning

[Kevin Oberman]

I am attempting to use a FreeBSD box with either a Myricom or Chelsio
10GE card to generate very large TCP streams over cross-country
links. The RTT for the test path is 94 ms. It is dedicated to my testing
at this time, so I have no contention other than a few KB of routing
updates.

Clearly, I need a very large window...about 120 MB, but I am unsure how
FreeBSD will handle this. (Unless I do other things, I suspect it will
not be pretty.) I imagine I will need a large kvm space, at the least,
but are there any other sysctls that are likely to need adjusting to
make this all work? IS it likely to work better on a amd64 system than a
i386?

Any suggestions would be appreciated.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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