*BSD News Article 75376


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From: smarq@ucthpx.uct.ac.za (S Marquard)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: FTP performance with pppd
Date: 4 Aug 1996 11:51:47 +0200
Organization: University of Cape Town
Lines: 26
Message-ID: <4u1rrj$6b2@ucthpx.uct.ac.za>
References: <32037C10.41C67EA6@solidsys.com> <32041EE6.8F6@www.play-hookey.com>
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Ken Bigelow <kbigelow@www.play-hookey.com> writes:

>Cam Johnson wrote:
>> 
>> I'm experiencing poor ftp transfer rates when using pppd.  Approx 600
>> byes per sec
>> via pppd and 2800 bytes per sec when using ijppp.  This is true for both
>> 2.1.5R and current.  Has anyone else seen this as my search of the
>> archives
>> has yielded nothing.
>> 
>> Thanks

>Too many possibilities to be sure without further data, but...

>Try adjusting your mtu size. As long as I'm on a dialup line, I set mtu 
>to 576. When/if I go to ISDN I'll up that.

I have got throughput of about 2700bps using pppd, vs 3100bps using ijppp
(with 28.8 modems). Adjusting the mtu/mru values hasn't helped.
I'd also like to know what the difference is.

Stephen Marquard
scm@silver.wcape.school.za
smarq@ucthpx.uct.ac.za