> 3. Better TCP windowing and better performance when all
> packets follow the same path.
Not really. TCP mostly cares about round-trip, not timing
of forward and backward paths.
Really, consider a link where the path carrying most of the data has
a time of N and the path carrying the ack has a path 2N or N + 1/2N
You are computing an average which seems like it could be skewed based
on the path the ack takes.
Does anyone know of any papers on the effect of asymetric paths on TCP
performance? This is a subject I have been thinking about in my
free time 
bjp@eng.umd.edu | Disclaimer: Can you be sure I even
uunet!eng.umd.edu!istari | exist: Let alone represent anyone
Brad Passwaters (Network Ronin) | or anything.