Date: Sun, 27 Jan 2002 17:04:41 EST From: TD790@aol.com To: neil@neilmcgann.co.uk, kstewart@owt.com Cc: freebsd-questions@freebsd.org Subject: Re: UDMA and 100Mbit NIC speed issues Message-ID: <15d.7fa5980.2985d379@aol.com>
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In a message dated 1/27/02 4:03:42 PM Eastern Standard Time, neil@neilmcgann.co.uk writes: > Realistically 100Mb/sec is flat out > for 33MHz PCI and trying to get some bandwidth for the NIC may just not be > do-able. Its more like 400Mb/s, but highly dependent on what else is on the bus. 100Mb/s is what you'll get with single quadword transactions, but any burstable bus-master will be able to do substantially better than that. You can do routing with dual full duplex 100Mb/s ethernets without seeing xmitter underruns, which requires 400Mb/s across the bus. A 3rd nic or disk transactions will cause problems beyond that. db To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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