Date: Thu, 7 Dec 1995 14:12:56 +0000 From: "Andrew Webster" <awebster@dataradio.com> To: freebsd-questions@freebsd.org Subject: Explain this! Message-ID: <199512071911.OAA00873@vhf.dataradio.com>
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Having recently upgraded a FreeBSD system from 2.0 to 2.1, I was left scratching my head over a strange performance related problem... The old system, FreeBSD 2.0-RELEASE on a 486/33, 16MB with AHA-1542, SMC8013 AST/4 port network card was getting a little long in the tooth with various quirks & oddities so I decided to upgrade it. The new system: FreeBSD 2.1.0-RELEASE on a 486/66, 24MB with AHA-1542, VLB S3 video, Digiboard PC/4, 3C509B NIC. I noticed that during large FTP xfers between my dos/windows box running winsock and the FreeBSD machine I was getting many timeouts, and FTP's (TCP's?) incremental backoff routine made the transfers excruciatingly long. Winsock was reporting many "unacceptable segemnts" and was backing off longer and longer each time. For the record, the dos box is a 486/66 with a 3C509B in it. On a hunch, I put the SMC8013 back into the new machine, and now it works as fast (maybe faster) than it used to! This leaves me wondering: 1. Is the 3C509 card a piece of junk? It works okay on my dos box with the SMC card in the BSD box! 2. Is the ep0 driver corrupting data packets? I tried all sorts of MTU sizes on the dos box, it still didn't work any better. 3. Is the ep0 driver dropping ack packets from the FTP client? Don't know. Anyone care to comment on this? Thanks! ----------------------------------------------------------------------- Andrew Webster Network Manager / Special Projects Dataradio Inc. 200-5500 Royalmount Ave. TEL: +1 514 737 0020 Town of Mount Royal, QC, CANADA H4P 1H7 FAX: +1 514 737 7883 http://www.dataradio.com Email: awebster@dataradio.com
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