Path: utzoo!attcan!uunet!mcvax!inria!piquer
From: piquer@inria.UUCP (Miguel Piquer)
Newsgroups: comp.dcom.modems
Subject: Re: more real data for Trailblazers and Argentina
Summary: Trailblazers in transatlantic links
Keywords: Trailblazers performance transatlantic
Message-ID: <710@inria.UUCP>
Date: 10 Jun 88 11:58:10 GMT
References: <14605@uunet.UU.NET> <10127@mcdchg.UUCP>
Organization: INRIA, Rocquencourt, France.
Lines: 34

In article <10127@mcdchg.UUCP> heiby@mcdchg.UUCP (Ron Heiby) writes:
>Rick Adams (rick@uunet.UU.NET) writes:
>> 	5/30 17:23 48294 bytes 43.90 secs 8799 bps
>> 	5/30 17:24 30301 bytes 26.71 secs 9075 bps
>>	[...]
>> 	5/30 17:34 50714 bytes 40.66 secs 9978 bps
>> 	5/30 17:35 29146 bytes 19.93 secs 11699 bps
> [...]
>at the wall clock time.  I am assuming that this set of 11 transfers took
>place on a single call.  I have added the total bytes and get 376,334 in
>12 minutes.  This works out to be 522.7 cps, or slightly better than half
>what it appears to be at first.
> [...]
>Anyone have any thoughts on the matter? 
>It looks to me like with a reliable link,
>that bigger files are even more of a win with Telebit speeds than with
>1200 bps modems.
	I agree, I have seen the experiences in Chile (with a much lesser
throughput) and the Trailblazer does a better job than the computer, which
looses all his time scanning directories and searching for jobs, which
normally are many short mail files (with its short commands files).
I don't have the data at hand but I do know that the people there
are planning a batch system that collects all the mails in
a big file doing only one big transfer each time, hoping
to get a much better performance. I think that Argentina has the same
problem: a super modem, a super PTT (much better than the chilean one...)
with a normal computer. Perhaps they can use the same solution (or buy a
bigger machine :-)), but we are falling in a new problem: the communications
are running faster than the computers :-).

>Ron Heiby, heiby@mcdchg.UUCP	Moderator: comp.newprod & comp.unix

Jo Piquer, piquer@inria.inria.fr
"A chilean lost in France"