PHWinfo - Afficher un message - strange FTP problem--transatlantic asymmetry

07/05/2007, 19h07

Are you certian the same TCP window size is used in each direction?
Not all FTP clients/servers use the same settings, and it is possible
to have assymetric performance as a result.

When you say the latency and packet losses on pings look fine, what is
your numeric defintion of "fine" here?-)

Can you reproduce the assymetric performance with something else
besides FTP? Naturally I would suggest netperf, but then I have a
built-in preference

http://www.netperf.org/

rick jones
--
The computing industry isn't as much a game of "Follow The Leader" as
it is one of "Ring Around the Rosy" or perhaps "Duck Duck Goose."
- Rick Jones
these opinions are mine, all mine; HP might not want them anyway...

feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

07/05/2007, 19h07	#4
Rick Jones Messages: n/a Hébergeur:	Re: strange FTP problem--transatlantic asymmetry Are you certian the same TCP window size is used in each direction? Not all FTP clients/servers use the same settings, and it is possible to have assymetric performance as a result. When you say the latency and packet losses on pings look fine, what is your numeric defintion of "fine" here?-) Can you reproduce the assymetric performance with something else besides FTP? Naturally I would suggest netperf, but then I have a built-in preference http://www.netperf.org/ rick jones -- The computing industry isn't as much a game of "Follow The Leader" as it is one of "Ring Around the Rosy" or perhaps "Duck Duck Goose." - Rick Jones these opinions are mine, all mine; HP might not want them anyway... feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...