UDP vs. TCP distribution [was: Re: [e2e] Can feedback be generated...]

[Sean Doran]

Alberto Cerpa <cerpa at ISI.EDU> writes:

> Do you have some measurements to back this up?  I would be really
> interested to get any pointers to some data available confirming this.

What type of measurements would you be looking for?

My assertion of "works great" is based on some
measurements of RTT (absolute and variability) and loss
various networks here and there use to construct their
SLAs.  In the little network in which I play, all approach
the minimum most of the time, even in outlying places like
Bratislava, Budapest, Bucharest, Prague and so on, that
are in the "Eastern Europe" someone suggested was badly
connected to the world.

Yes, TCP's ACK clocking means things farther away from
each other are at a disadvantage, but realistically, it
*is* only ~190ms from Romania to Southern California
(which seems like a reasonable selection of worst case,
topologically speaking).

I am open to the argument that these are atypically good
numbers, and that performance to Eastern Europe (for
example) tends to be much worse.  In fact, I would love to
get such an argument into the hands of our sales people. :-) :-)

        Sean.
- --
robuc101-ta#trace 
Protocol [ip]: 
Target IP address: cs.ucsd.edu
Source address: 213.174.64.13
Numeric display [n]: 
Timeout in seconds [3]: 
Probe count [3]: 10
Minimum Time to Live [1]: 
Maximum Time to Live [30]: 
Port Number [33434]: 
Loose, Strict, Record, Timestamp, Verbose[none]: 
Type escape sequence to abort.
Tracing the route to cs.ucsd.edu (132.239.51.18)
  1 atvie103-ta-s1-0.ebone.net (213.174.70.81) 20 msec 20 msec 12 msec 16 msec 12 msec 24 msec 16 msec 12 msec 16 msec 12 msec
  2 atvie101-tc-r6-0.ebone.net (195.158.245.49) 16 msec 20 msec 12 msec 16 msec 20 msec 20 msec 12 msec 16 msec 12 msec 16 msec
  3 czpra103-tc-p2-0.ebone.net (195.158.242.45) 20 msec 28 msec 28 msec 28 msec 20 msec 24 msec 24 msec 24 msec 20 msec 20 msec
  4 debln302-tc-p2-0.ebone.net (213.174.70.45) 32 msec 32 msec 28 msec 36 msec 32 msec 32 msec 36 msec 40 msec 32 msec 28 msec
  5 debln301-tc-p1-0.ebone.net (213.174.70.37) 32 msec 40 msec 28 msec 36 msec 36 msec 36 msec 32 msec 32 msec 32 msec 32 msec
  6 dedus206-tc-p6-0.ebone.net (213.174.70.41) 36 msec 44 msec 36 msec 40 msec 40 msec 36 msec 40 msec 40 msec 36 msec 36 msec
  7 dedus205-tc-p7-0.ebone.net (213.174.70.125) 40 msec 40 msec 40 msec 36 msec 36 msec 40 msec 40 msec 44 msec 48 msec 40 msec
  8 nlams303-tc-p2-0.ebone.net (213.174.70.134) 40 msec 40 msec 40 msec 40 msec 44 msec 40 msec 40 msec 40 msec 40 msec 44 msec
  9 bebru203-tc-p1-0.ebone.net (213.174.71.1) 44 msec 44 msec 44 msec 44 msec 44 msec 44 msec 44 msec 44 msec 40 msec 44 msec
 10 bebru204-tc-p2-0.ebone.net (195.158.225.82) 40 msec 44 msec 44 msec 44 msec 40 msec 48 msec 40 msec 48 msec 44 msec 48 msec
 11 gblon505-tc-p1-0.ebone.net (195.158.232.41) 48 msec 48 msec 48 msec 48 msec 52 msec 52 msec 48 msec 48 msec 48 msec 48 msec
 12 usnyk105-tc-p1-1.ebone.net (195.158.229.25) 116 msec 120 msec 116 msec 116 msec 120 msec 120 msec 116 msec 120 msec 120 msec 116 msec
 13 sl-bb11-nyc-5-3.sprintlink.net (144.232.9.229) [AS 1239] 116 msec 120 msec 116 msec 116 msec 120 msec 120 msec 116 msec 120 msec 124 msec 116 msec
 14 144.232.9.202 [AS 1239] 140 msec 116 msec 120 msec 116 msec 120 msec 116 msec 116 msec 120 msec 116 msec 116 msec
 15 pos3-0-622M.nyc-bb8.cerf.net (134.24.33.158) [AS 1740] 120 msec 120 msec 116 msec 120 msec 116 msec 120 msec 116 msec 116 msec 116 msec 120 msec
 16 so6-3-0-622M.chi-bb5.cerf.net (134.24.32.213) [AS 1740] 136 msec 136 msec 136 msec 136 msec 136 msec 140 msec 136 msec 140 msec 132 msec 148 msec
 17 pos2-0-622M.chi-bb3.cerf.net (134.24.33.197) [AS 1740] 136 msec 140 msec 136 msec 140 msec 136 msec 140 msec 140 msec 136 msec 140 msec 136 msec
 18 pos0-0-622M.sfo-bb4.cerf.net (134.24.46.58) [AS 1740] 192 msec 192 msec 188 msec 192 msec 192 msec 188 msec 188 msec 188 msec 188 msec 192 msec
 19 pos7-0-622M.sfo-bb3.cerf.net (134.24.32.78) [AS 1740] 196 msec 196 msec 196 msec 196 msec 196 msec 192 msec 196 msec 196 msec 200 msec 196 msec
 20 pos3-0-622M.lax-bb4.cerf.net (134.24.29.234) [AS 1740] 192 msec 188 msec 192 msec 192 msec 188 msec 192 msec 188 msec 192 msec 192 msec 192 msec
 21 so1-0-0-622M.lax-bb7.cerf.net (134.24.33.170) [AS 1740] 188 msec 192 msec 188 msec 192 msec 192 msec 192 msec 188 msec 192 msec 192 msec 188 msec
 22 so-6-0-0.san-bb4.cerf.net (134.24.29.13) [AS 1740] 196 msec 192 msec 196 msec 196 msec 192 msec 196 msec 196 msec 196 msec 196 msec 196 msec
 23 pos1-0-0-155M.san-bb1.cerf.net (134.24.29.190) [AS 1740] 196 msec 196 msec 196 msec 196 msec 204 msec 196 msec 196 msec 192 msec 444 msec * 
 24 sdsc-gw.san-bb1.cerf.net (134.24.12.26) [AS 1740] 204 msec 204 msec 200 msec 200 msec 204 msec 208 msec 200 msec 204 msec 208 msec 200 msec
 25 bigmama.ucsd.edu (192.12.207.5) [AS 195] 220 msec 220 msec 228 msec 220 msec 292 msec 236 msec 244 msec 248 msec 232 msec 224 msec
 26 cse-rs.ucsd.edu (132.239.254.45) [AS 7377] 224 msec 224 msec 244 msec 224 msec 224 msec 228 msec 228 msec 228 msec 224 msec 224 msec
 27 cs.ucsd.edu (132.239.51.18) [AS 7377] 216 msec *  212 msec *  212 msec *  212 msec *  208 msec *