[e2e] a few questions on TCP mechanism

Michael Welzl michael.welzl at uibk.ac.at
Mon Sep 13 08:42:06 PDT 2004

> >b. If the only source of feedback is the destination
> >point, how is it possible for me to:
> >1. adjust my window size in T < RTT
> In general, you shouldn't.  As I understand control theory, if you adjust
> in times smaller than the RTT, your control loop is unstable.

Great that you bring this up: it's something that I never really
understood - how does this thinking translate to TCP, which
updates the rate with every ACK it gets (a lot more often than
once per RTT)? Is TCP actually interpolating?


More information about the end2end-interest mailing list