Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!cbmvax!grr
From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.dcom.modems
Subject: Re: How to speed up uucp with Telebits(only getting 800 chars/sec )
Message-ID: <7355@cbmvax.UUCP>
Date: 19 Jul 89 02:58:43 GMT
References: <612@lakart.UUCP> <277@hitech.ht.oz>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 33

In article <277@hitech.ht.oz> clyde@hitech.ht.oz (Clyde Smith-Stubbs) writes:
> From article <612@lakart.UUCP>, by dg@lakart.UUCP (David Goodenough):
> > it has such a grody line that it can only use 200 of them. Can you say
> > lost bandwidth? There, I knew you could.
> > 
> On an international line from Australia to USA (nwnexus) my trailblazer
> consistently reported (via the appropriate S register) an instantaneous
> bit rate of 14000 bps yet I can only get around 450 bytes/second
> throughput. Listening to the modem there seems to be a fair bit of
> idle time. I can only conclude that the loss of performance is in the
> machines rather than the modems. My machine is a 20MHz 386 with Stallion
> serial I/O (super smart) at 19200. Nwnexus is a VAX 750 with unknown
> serial I/O at 9600 and unknown loading. I did enquire about the hardware
> and system load but got no response. From my own experience a VAX 750
> runs out of puff in the CPU department very easily. Anyone got any
> comments?

Given that the machine is a VAX, probably with DZ11's if they can't
do more than 9600 baud, and is a public access system with many news
and uucp connections, it's quite possible that they're bogged down.

You should expect speeds in the 700's with a "good" 9600 PBS connection.
I'm not sure how far I'd trust the "speed" registers - not enough
information is given to interpret them with assurance.

The key would be to look at the variance and especially look at any
coorelation with the time you access the remote system.  Is it ever
fast?

-- 
George Robbins - now working for,	uucp: {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)