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- Xref: sparky comp.protocols.tcp-ip:5671 comp.protocols.tcp-ip.ibmpc:7019
- Newsgroups: comp.protocols.tcp-ip,comp.protocols.tcp-ip.ibmpc
- Path: sparky!uunet!noc.near.net!vaxeline.ftp.com!cream.ftp.com!jbvb
- From: jbvb@vax.ftp.com (James B. VanBokkelen)
- Subject: Re: RAW SPEED numbers for various TCP-IP implementations
- Message-ID: <921217164155@cream.ftp.com>
- Nntp-Software: PC/TCP NNTP
- Keywords: PC/TCP tuning
- Lines: 24
- Sender: root@vaxeline.ftp.com (vaxeline.ftp.com root account)
- Nntp-Posting-Host: whipped-cream.ftp.com
- Reply-To: jbvb@ftp.com
- Organization: FTP Software, Inc., Wakefield, MA
- References: <ByrLr7.8vr@waterloo.hp.com> <1992Dec7.165101.2313@acc.com> <92343.102239FFAAC09@cc1.kuleuven.ac.be> <1992Dec8.170509.3181@acc.com> <92345.230225FFAAC09@cc1.kuleuven.ac.be>
- Date: Thu, 17 Dec 1992 16:41:55
-
- In article <92345.230225FFAAC09@cc1.kuleuven.ac.be> Paul Bijnens <FFAAC09@cc1.kuleuven.ac.be> writes:
-
- There are normally 5 buffers in my PC/TCP-implementation.
-
- With 5 buffers, I usually set my TCP window to 4096. I don't recommend
- specifying a low-window - the value we pick automatically is reasonable
- and other values may provoke more problems than they solve.
-
- Yes, the Compac and the PC are connected with a Vines network on
- ARCNET. ARCNET is 2.5 Mbit/sec, and has not much problem to get
- effectively about 2.5 Mbit/sec throughput out of it (measured using
- the dos command "copy" to just copy a file across the cable). So
- I doubt Vines is the guilty party.
-
- With the small TCP windows you're using, the round-trip-time through the
- routers will dominate transmission speed. Still, if Ascii transfers are
- notably slower than Binary, a slight difference in timing is probably
- provoking a pathological condition. In INET DEBUG, check for errors
- and "out of buffers" conditions. In INET STAT, check both "rexmits"
- and "duplicate packets". In INET TCP, see what the round trip time
- for the connection is (you can get this while shell-escaped).
-
- James B. VanBokkelen 2 High St., North Andover, MA 01845
- FTP Software Inc. voice: (508) 685-4000 fax: (508) 794-4488
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