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- Newsgroups: comp.dcom.lans.ethernet
- Subject: Re: Ethernet card
- Message-ID: <92358.084201RBYAML@rohvm1.rohmhaas.com>
- From: Aengus Lawlor <RBYAML@rohvm1.rohmhaas.com>
- Date: Wed, 23 Dec 1992 08:42:01 EST
- References: <1992Dec18.014021.24510@fallst><1992Dec18.175556.27179@tandem.com> <msz.725076053@zen>
- Organization: Rohm and Haas Company
- Lines: 72
-
- In article <msz.725076053@zen>, msz@ESD.3Com.COM (Mark Zaller) says:
- >mbeyer@zamboni.NSP-SERVER1 (Mark D Beyer) writes:
- >>> What's wrong with the 3c503?
- >
- >>I forget the exact model numbers, but I think 3COM has much better
- >>adapters than the 3C503 now. The 3c503 wasn't particularly fast.
- >>I think there's a 3c507.
- >>--
- >
- >The 3C503 is a good card with compatibility being its best asset. The 3C507 is
- >an excellent server card. 3Com's best card today (and least expensive),
- >especially for clients is the 3C509 (EtherLink III). It also autoconfigures
- >and it is fast.
-
- I have been having some interesting experiences with 3COM 3C503/16s and
- 3C509s recently.
-
- We have a large population of PCs (386SX/16s through 486/50s), running
- PathWorks 4.1 and Windows 3.1. Most of the workstations have 8-bit 3C503s
- installed, with shared memory disabled. We have been using some 486/33 PCs
- as OS/2 servers, and recently installed a 486/50 OS/2 server. Surprisingly,
- it took longer to load Windows applications from the 486/50 server than from
- the 486/33 server. Nortons SYSINFO showed that throughput to the faster
- server was at least 20% better than to the 486/33 server, so something was
- definitely afoot!
-
- (Loading Extra! for Windows from the 486/33 server to a 386sx/16 PC took
- 40 seconds, with a 3C503 in the PC. It took 80 seconds to load from the
- 486/50).
-
- On a hunch, I ran the 486/50 in "slow" mode, and Nortons SYSINFO showed
- throughput down to about 80% of the figure for the 486/33, but the PC now
- loaded Extra! for Windows in 40 seconds!
-
- I decided that the server was serving the data so fast that the workstation
- couldn't keep up, so it dropped packets, and had to wait for a timeout and
- re-transmission.
-
- So I decided to try one of the new, fast 3C509s in my my 386SX/20, and
- Extra! took between 60 and 80 seconds to load from the 486/50 server, and
- about 50 seconds from the 486/33. This didn't seem right, so I got out a
- brand new 3C506/16, with shared memory enabled, replaced the 3C509, and now
- Extra! loaded in just under 30 seconds from the 486/50, and just over 30
- from the 486/33. This was more like it, so I disabled the shared memory,
- and it still loaded in just over 30 seconds from the 486/33 (as against
- 50 seconds using a 3C509), but it now took about 50 seconds to load from
- the 486/50 server!
-
- To top it all off, I tried to load Extra! on a 486/50 workstation, with
- a 3C503/16, shared memory disabled, and it took about 18 seconds from the
- 486/50 server, and about 21 seconds from the 486/33 server.
-
- Now I don't know whether the problems I saw were due to NDIS, or to PathWorks,
- but in a timeslicing environment like Windows, a RAM buffer may be pretty
- important, and the 3C509 may not be the card you're looking for.
-
- If anyone has any suggestions for tuning the software (either by changing
- PROTOCOL.INI parameters, or by changing PathWorks paramaters, or by
- changing Windows parameters) I'd appreciate it if you let me know. If anyone
- has had the opportunity to compare the 3C509 to the 3C503 on other networks
- especially with Windows, I'd also be interetsed in hearing what your
- impressions are. (Fast servers and relatively slow workstations, ie 386SX/16s
- are most likely to highlight this situation).
-
- >
- >-Mark Zaller
- Aengus
- --
- RBYAML@ROHMHAAS.COM Aengus Lawlor
- RBYAML@ROHVM1.BITNET (who used to be ALAWLOR@DIT.IE)
- "How about some of that famous Dublin wit, Barman?"
- "Certainly, sir. Would that be Dry or Sparkling?"
-