Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!husc6!cmcl2!rutgers!bellcore!texbell!root
From: root@texbell.UUCP (root)
Newsgroups: comp.dcom.modems
Subject: Re: Telebit transfer rate problem
Message-ID: <763@texbell.UUCP>
Date: 28 Mar 89 17:58:14 GMT
References: <640@island.uu.net> <7457@fluke.COM>
Reply-To: root@texbell.UUCP (Greg Hackney)
Organization: texbell gateway, Dallas
Lines: 21

In article <640@island.uu.net> brad@island.uu.net (Bradley Mabe) writes:
> When connecting to another site via uucp in pep mode we get an average 
> send rate of around 1200 bytes per second, but and average receive rate 
> of only 500 bytes per second.

In article <64160@pyramid.pyramid.com> romain@pyramid.pyramid.com (Romain Kang)
 writes:
> each character received means a CPU interrupt
> and a couple of context switches, and has to filter through the raw tty
> interface.

In article <7457@fluke.COM> jeff@tc.fluke.COM (Jeff Stearns) writes:
> You have discovered that the Sun kernel burns a lot of cycles servicing
> interrupts from the Systech serial interface when performing raw input.

Question: How much greater is the cpu load when receiving uucp than
when transmitting a file? Or is the disparity mainly due to Telebit
buffering?
--

Greg