Date: Fri, 23 Nov 2001 16:22:21 +0100 From: sthaug@nethelp.no To: tlegvold@hotmail.com Cc: freebsd-net@freebsd.org Subject: Re: Maximum throughput of Intel Pro 100/S NIC? Message-ID: <41888.1006528941@verdi.nethelp.no> In-Reply-To: Your message of "Fri, 23 Nov 2001 09:07:50 " References: <F122AddX47sFoai8XKP00013619@hotmail.com>
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> >I have got 96% of 100Mbps under real production load. > > Wouldn't the TCP/IP overhead + ethernet design (collisions) reduce this > figure to more like 70Mbs max in the real world? As has been pointed out, a lot of people run full duplex these days. With FD ethernet, the maximum achievable bandwidth is easy to compute, but depends on which protocol level you're looking at: - 1500 byte Ethernet payload: Maximum is 1500 / (1500 + 18 + 8 + 12) = 97.53% (ie. 97.53 Mbps for 100 Mbps Ethernet). - 1460 byte TCP payload: Maximum is 1460 / (1500 + 18 + 8 + 12) = 94.93% (ie. 94.93 Mbps for 100 Mbps Ethernet). FreeBSD can get extremely close to these limits. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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