[3058] in linux-net channel archive
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daemon@ATHENA.MIT.EDU (Olaf Titz)
Wed May 29 20:02:03 1996
Date: Wed, 29 May 96 10:32 MET DST
From: olaf@bigred.inka.de (Olaf Titz)
To: submit-linux-dev-net@ratatosk.yggdrasil.com
Newsgroups: linux.dev.net
Path: not-for-mail
From: Olaf Titz <olaf@bigred.inka.de>
Subject: Re: PPP *outgoing* slow
Message-ID: <ds5rpe.g2z@bigred.inka.de>
Date: 29 May 1996 10:32:02 +0100
References: <4odjjk$l0g@server3.mersinet.co.uk>
Organization: private Linux site, southern Germany
Lines: 25
<athan@mersinet.co.uk> wrote:
> I now get 'good' transfers INTO my machine (specs follow), but get
> absolutely *AWFUL* transfer rates out of it.
A problem often observes with packet-acknowledge protocols like
zmodem: if you lose many incoming packets, the outgoing transfer rate
goes down. Paradoxical it may sound, but losing acknowledge packets is
worse than losing data packets because it tends to cause long idle
timeout waiting. The same can happen with TCP especially if you run
mainly one TCP connection at a time.
> It runs a ppp link between itself and my other machine as well, which is
> ppp0 (16450 UARTs either end set to 115.2kbps, drops a few packets here
^^^^^ ^^^^^^^^^
> and there). The external link is ppp1:
There's the reason. For 115.2kbps, you absolutely must install a '550A
if you don't want frequent packet loss even with a very fast CPU.
olaf
--
___ Olaf.Titz@inka.de or @{stud,informatik}.uni-karlsruhe.de ____
__ o <URL:http://www.inka.de/~bigred/> <IRC:praetorius>
__/<_ >> Just as long as the wheels keep on turning round
_)>(_)______________ I will live for the groove 'til the sun goes down << ____
