Date: Mon, 19 May 1997 16:23:02 -0700 From: "Russell L. Carter" <rcarter@consys.com> To: sthaug@nethelp.no Cc: hutton@isi.edu, hackers@FreeBSD.ORG Subject: Re: throughtput measurements for fast ethernet Message-ID: <3380E0D6.EB2A5EC7@consys.com> References: <199705161709.KAA05644@conceptual.com> <12250.864080883@verdi.nethelp.no>
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sthaug@nethelp.no wrote: > > > I was hoping for something more specific. My _first_ tests with > the 3com vx > > > driver for the 395 pci card on FreeBSD 2.2.1 are not showing good > results - > > > highest throughput for UDP 45Mbps. I should stress that these were > first tests. > > > > > > Has anyone any traffic measurements for any of the fast ethernet > drivers? > > > > What kind of main memory bandwidth can your motherboards sustain? A > > > good test is the stream benchmark from McCalpin. Many P6 > motherboards > > can sustain transfer rates which drive 100mb ethernet at full > throttle, > > but a lot of P5 motherboards cannot. 45Mbps is not unusual for > these. > > I doubt motherboards are the issue here. I've measured 79 Mbps between > > two P133s (430FX chipset), using SMC (21140 based) cards. This was > done > more than a year ago, and the results are in the Netperf database. I > got > the same figures with ttcp. > > Steinar Haug, Nethelp consulting, sthaug@nethelp.no Well, it does matter. These had pipelined burst SRAM, right? Anything with async SRAM will run around 45Mbits/s with 21140 cards. The same CPU with PB-SRAM agrees with what you report. However, she mentioned that other interfaces weren't affected, so in this case it's not the motherboard, and since I haven't tested the throughput for the 3com driver I can't say for sure that it *isn't* the driver. Russell
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