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Date: Sun, 28 Jan 1996 00:27:21 -0800
From: Jonathan Hahn <hahn@and.com>
Message-Id: <199601280827.AAA17566@and.com>
To: freebsd-bugs@freebsd.org, freebsd-isp@freebsd.org
Subject: Latency problem with pppd/Telebit Netblazer
Sender: owner-bugs@freebsd.org
Precedence: bulk

I am using pppd under FreeBSD 2.1, my ISP (Bay Area Internet
Solutions) has a Telebit Netblazer.  Ever since I switched to this
ISP, I noticed a very annoying latency on outbound characters.  I
could type text into an xterm window and it would take from 1-4
seconds to get transmitted over my modem; and I could get 30+Kb/sec
inbound but just ~4Kb/sec outbound.  (I didn't have this problem
with my previous ISP (Best) who uses Livingston boxes.)

I tried one change to my software/hardware config after another.
I finally found the cause of the problem: it goes away when I
disable Van Jacobsen header compression (-vj on the pppd command
line).  My ISP says everyone else uses VJ compression and has no
problem.  All I know is, it caused me much grief.

Hope others can benefit from my experience.

-jon
hahn@and.com
http://and.com/hahn

P.S. I don't subscribe to these groups, so e-mail directly if trying
to reach me.