ted@hpwrce.HP.COM ( Ted Johnson) (02/21/90)
How many chars/sec should a "good" implementation of kermit transmit? Using a Hayes 1200, I got 70 chars/sec Using a Hayes 2400, I got 118 chars/sec A quick back-of-the-envelope calculation shows that the theoritical (sp?) max. thruput is 150 chars/sec and 300 chars/sec, for the 1200 and 2400 baud modems (assuming that these both use 2 signal levels, so that bps = baud..., which may not be true). I tested this w/ 6.0.3, and Red Ryder 9.4, to a HP-UX machine, with a 90k file, on a moderately noisy line. Question: does Red Ryder suck, or are these typical thruput numbers? -Ted "Where does he get all those wonderful toys?" - The Joker
russotto@eng.umd.edu (Matthew T. Russotto) (02/22/90)
In article <7380043@hpwrce.HP.COM> ted@hpwrce.HP.COM ( Ted Johnson) writes: >How many chars/sec should a "good" implementation of kermit transmit? > >Using a Hayes 1200, I got 70 chars/sec >Using a Hayes 2400, I got 118 chars/sec > >A quick back-of-the-envelope calculation shows that the >theoritical (sp?) max. thruput is 150 chars/sec and 300 chars/sec, >for the 1200 and 2400 baud modems (assuming that these both >use 2 signal levels, so that bps = baud..., which may not be true). > Kermit, using small blocks, is pretty slow. Also, your theroetical max is off- it's 120cps and 240cps at 8-n-1. I'm not going to deny that Red Ryder is a dog though. If you can use another protocol, do so. -- Matthew T. Russotto russotto@eng.umd.edu russotto@wam.umd.edu ][, ][+, ///, ///+, //e, //c, IIGS, //c+ --- Any questions?
newton@cs.utexas.edu (Peter Newton) (02/22/90)
>In article <7380043@hpwrce.HP.COM> ted@hpwrce.HP.COM ( Ted Johnson) writes: >>How many chars/sec should a "good" implementation of kermit transmit? >> >>Using a Hayes 1200, I got 70 chars/sec >>Using a Hayes 2400, I got 118 chars/sec If you want fast transfers, try ZTerm 0.85. It goes at about 95% of the max possible at 2400 Baud. It manages 85% at 19.2 KB. The file transfer protocol is very good. Unfortunately, the terminal emulation is poor. It messses up the version of the emacs screen editor I use. --- Peter Newton Computer Sciences, TAY 2.124 (512) 471-9735 University of Texas at Austin newton@cs.utexas.edu Austin, TX 78712-1188 ...{uunet|gatech|ames}!cs.utexas.edu!newton
meuchen@grad2.cis.upenn.edu (Paul Eric Menchen) (02/22/90)
In article <7380043@hpwrce.HP.COM> ted@hpwrce.HP.COM ( Ted Johnson) writes: >How many chars/sec should a "good" implementation of kermit transmit? > >Using a Hayes 1200, I got 70 chars/sec >Using a Hayes 2400, I got 118 chars/sec ... >I tested this w/ 6.0.3, and Red Ryder 9.4, to a HP-UX machine, with >a 90k file, on a moderately noisy line. ... >Question: does Red Ryder suck, or are these typical thruput numbers? Kermit sucks if you're looking for thruput. Your milage may very, but 50% efficiency is about as good as it gets for binary files. I get up to 75% or so for text. I'm using a 7E1 hardwire connection, but I think these numbers will apply to 8 data bits as well. Paul Eric Menchen meuchen@grad1.cis.upenn.edu
yossie@marque.mu.edu (02/23/90)
Well, I've been using ZMODEM on a 1200 line typically with 96% efficiecy - I.e. 116 chars/second. I have actually got it as high as 119 chars/second (99%) with some BBS's! ZMODEM has many other nice things about it. Give it a try. - Yossie