Channel Distances 2764

Peter

but there is hardly a vendor out there that doesn't quote media rate ... and there can be enormous number of reasons why sustained thruput would be less

the original vendor mainframe tcp-ip product achieved 44kbytes-sec and burned a full 3090 processor. i added rfc1044 support to the product

and in some tuning work at cray research, we got 1mbyte-sec sustained between a cray and a 4341-clone ... using only a modest amount of a the 4341-clone processor. the 1mbyte-sec was the channel media speed between the 4341 channel and the NSC router channel interface (much lower than the either the cray channel interface or the NSC-to-NSC box interface)

part of the difference was that the standard vendor box (8232) wasn't a tcp-ip rounter ... but a lan bridge. the mainframe tcp-ip code had to do the tcp-ip protocol to mac translation. for the rfc1044 support, I just had to exchange tcp-ip packets with the NSC router. that and various other factors resulted in rfc1044 having ratio of mbytes transferred to mips executed showing nearly three orders of magnitude improvement.

i once worked on an early lan crypto hardware that was suppose to sustain media speed with minimum sized packets and support switching keys on every packet ... now that got interesting.