🚀 go-pugleaf

marc@r-node.gts.org (Marc Fournier - Sys Admin) writes:

> Hi Folks...
> 
> 	Stupid question of the week...maybe even the year...but it
> has me curious :)
> 
> 	Why do I get better speeds with zmodem using v.32bis on
> a Worldblazer then uucico?

   ZMODEM is a streaming protocol.  While it may incurr higher overhead than 
some protocols (such as YMODEM-G), it does a good job of maintaining roughly 
95% of maximum possible throughput on any given link - up to the machines' 
maximum capabilities, of course.

   Still, if you have protocol spoofing enabled on the WB (I believe that the 
WB supports spoofing over V.32bis, does it not?), you should get close 
figures.

   If not, then what's happening is that the transmitting end sends 3 (or 7) 
packets of 64 bytes long before the ACK for the first packet arrives, so the 
transmitter shuts up... and throughput capability goes unused.  This pause is 
what ZMODEM circumvents.

Geoffrey Welsh, 7 Strath Humber Court, Islington, Ontario, M9A 4C8 Canada
geoff@zswamp.uucp, [xenitec.on.ca|m2xenix.psg.com]!zswamp!geoff (416)258-8467
         Coincidentally, most people who fight for "fairness" would be
         significantly better off under the system they call "fair"...