Re: Multiple TCP/IP servers on one host


prue@venera.isi.edu
Thu, 15 Sep 88 10:36:29 PDT


>> 1) If the second path was 25% of the speed of the first path then 25% of
>> the packets could be sent that way. [...]
>> if the two end sides were running the Van Jacobsen/Mike Karels code
>> I believe this wouldn't be to much of a problem. [...]
>
>
>The first thing (splitting load among routes) would screw up the
>Jacobson/Karels improved TCP completely. They get a big win by
>estimating the variance of the round trip time; using alternating
>routes for different packets would drive this variance way up, causing
>the timeout to be set high, causing long stoppages on lost packets.

I disagree. The first path is four times as fast but has four times as
many packets. The link delay is only 1/4 the second line but the queuing
delay is four times as great. The variation of the delivery times for the
five packets would be less than using a single line. As the queue sizes go
up the variation in the network delay goes up.

I do however agree with your other point, type of service routing could
put the second path to very good use.

Requards,

Walt Prue
Prue@isi.edu



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