TCP performance


art@acc.arpa
29 Sep 87 16:15:00 PST


Hey Folks,

Physics won't let us go infinitely fast!!!
A practical limit is probably related to distance.

Lets look at the facts:

        TCP has a maximum window size of 65535 bytes (16 bit field).

        Single satellite hop is approx. 1/2 sec round trip (approx.
        90 Thousand miles).

        Thus for satellite, max. rate is about (65535*8)/(0.5)
          or 1.048 Megbit/sec.

        Coast to Coast should be about 30 times quicker, or
        about 30 Megbit/sec.

Of course, this is for a single TCP session, multiply for number of
concurrent sessions.

                                        Art Berggreen
                                        art@acc.arpa
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