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From: scotte@center.uscs.com (L. Scott Emmons)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: FreeBSD Losing to Linux - Please Help
Date: 04 Apr 1996 16:34:39 GMT
Organization: U.S. Computer Services Research Center, El Dorado Hills, CA
Lines: 32
Message-ID: <SCOTTE.96Apr4083440@odie.center.uscs.com>
References: <4ju4rb$67q@post.gsfc.nasa.gov>
NNTP-Posting-Host: odie.center.uscs.com
To: kjeffers@nastg.gsfc.nasa.gov (Karen Jefferson x2857)
In-reply-to: kjeffers@nastg.gsfc.nasa.gov's message of 3 Apr 1996 15:18:03 GMT
In article <4ju4rb$67q@post.gsfc.nasa.gov> kjeffers@nastg.gsfc.nasa.gov (Karen Jefferson x2857) writes:
> Although our preference had been to use FreeBSD, the UDP performance
> was terrible (200 Kbps over Ethernet), and we kept getting ENOBUF
> errors which makes FreeBSD an unacceptable choice.
Are you 100% positive it's the O/S and not your PC hardware, NIC, or
configuration? Is TCP performance acceptable (i.e. are you postive
it's attributable directly to UDP?)
I just did some simple and nonconclusive tests and by using different
hardware the difference was 10-fold. I transfered a fairly large (3Mb)
file via NFS and here's what I got:
CPU Memory NIC Xfer Rate
====== ====== ============== =========
386/33 8Mb 3C503 (8 bit) 100 KBps
486/66 8Mb 3C509 (16 bit) 950 KBps
Again, this is far from any sort of conclusive test, and it ignores
the whole TCP vs. UDP issue, but it shows what a difference the
hardware makes. Both systems are running FreeBSD 2.1 (Jan 1996 CD).
I suspect that changing out the O/S is not going to help one bit, but
you certainly can try to do so and see what happens.
Good luck,
--
__________________________________O-___________________________________
L. Scott Emmons |CableData R&D Center - El Dorado Hills, CA, USA
(916)939-6088 |>> Standard disclaimer applies. Views are my <<
scotte@center.uscs.com |>> own, not those of U.S. Computer Services. <<