Date: Sun, 18 Jul 1999 00:37:53 +0200 From: sthaug@nethelp.no To: vince@venus.GAIANET.NET Cc: tim@storm.digital-rain.com, freebsd-hackers@FreeBSD.ORG Subject: Re: poor ethernet performance? Message-ID: <60044.932251073@verdi.nethelp.no> In-Reply-To: Your message of "Sat, 17 Jul 1999 14:25:41 -0700 (PDT)" References: <Pine.BSF.4.05.9907171422550.331-100000@venus.GAIANET.NET>
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> 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'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... Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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