Newsgroups: comp.dcom.sys.cisco
Path: utzoo!utgpu!cunews!bcars8!bnrgate!bigsur!bcars53!mussar
From: mussar@bcars53.uucp (G. Mussar)
Subject: Re: Questions on X.25
Message-ID: <1990Jun8.202750.27032@bigsur.uucp>
Sender: news@bigsur.uucp (Usenet)
Organization: Bell-Northern Research, Ottawa, Canada
References: <21285@boulder.Colorado.EDU>
Date: Fri, 8 Jun 90 20:27:50 GMT


We have measured throughput for multiple,
simultaneous memory-to-memory data transfers
using TCP/IP between UNIX workstations, with
CISCO routers connected via a 1- or 2-hop X.25
packet switched network, and with the routers
directly connected by a dedicated link.
Results indicate about 88% throughput efficiency
with the X.25 network, compared to 95% throughput
efficiency with dedicated link.  There is a slight
degradation (2-3%) in both configurations,  when
long transmission (e.g. satellite) delays
(50 to 500 ms) are added.

It is useful to set parameters for high efficiency
transfer: e.g. X.25 windows to 7, packet sizes to
512 bytes, etc.

--
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Gary Mussar  |Bitnet:  mussar@bnr.ca                  |  Phone: (613) 763-4937
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