Date: Sat, 17 Jul 1999 15:43:22 -0700 (PDT) From: Vincent Poy <vince@venus.GAIANET.NET> To: sthaug@nethelp.no Cc: tim@storm.digital-rain.com, freebsd-hackers@FreeBSD.ORG Subject: Re: poor ethernet performance? Message-ID: <Pine.BSF.4.05.9907171538120.331-100000@venus.GAIANET.NET> In-Reply-To: <60044.932251073@verdi.nethelp.no>
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On Sun, 18 Jul 1999 sthaug@nethelp.no wrote: > > It meets the spec when shipped but the bends, curves, temperature > > and other factors do affect the performance. I guess a good way to test > > the cable is with FreeBSD since it's the only real OS I've seen that can > > do like real world speeds. The only thing is that has anyone really saw > > 12 Megabytes/sec Full Duplex under FreeBSD? > > If you mean mega = 1048576, it's impossible since this is faster than 100 > Mbps whichever way you count it. > > If you mean mega = 1000000, it depends on which way you're counting. The > "speed of light" for TCP, application to application, on 100 Mbps Ethernet > is 100 * 1460/1538 = 94.93 Mbps. This assumes full duplex. I mean Mega as in 1000000. 100Mbps Ethernet should be equal to about 12500Kbytes/sec which is equal to 12.5Mbytes/sec. 94.93Megabits/sec doesn't equal to 100Megabits/sec. > I've measured 94.87 Mbps myself on full duplex 100BaseTX (back to back > with a crossover cable or through a switch). This is close enough to > the "speed of light" that I see no point in trying to improve on it... Yeah but what's the transfer rate you get? Cheers, Vince - vince@MCESTATE.COM - vince@GAIANET.NET ________ __ ____ Unix Networking Operations - FreeBSD-Real Unix for Free / / / / | / |[__ ] GaiaNet Corporation - M & C Estate / / / / | / | __] ] Beverly Hills, California USA 90210 / / / / / |/ / | __] ] HongKong Stars/Gravis UltraSound Mailing Lists Admin /_/_/_/_/|___/|_|[____] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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