Date: Sun, 21 Mar 1999 15:31:55 -0500 (EST) From: Alfred Perlstein <bright@rush.net> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Terry Lambert <tlambert@primenet.com>, Dag-Erling Smorgrav <des@flood.ping.uio.no>, andreas@klemm.gtn.com, rsnow@lgc.com, hasty@rah.star-gate.com, ckempf@enigami.com, wpaul@skynet.ctr.columbia.edu, freebsd-hackers@FreeBSD.ORG Subject: Re: Gigabit ethernet -- what am I doing wrong? Message-ID: <Pine.BSF.3.96.990321153026.4169I-100000@cygnus.rush.net> In-Reply-To: <199903211956.LAA14406@apollo.backplane.com>
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On Sun, 21 Mar 1999, Matthew Dillon wrote: > > : > :That is zero copy, packet is DMA'd from card, then sent via DMA > :to another card, hence 0 copy. The CPU doesnt' have much work to > :do besides the DMA setups and a quick packet check, look at the > :fastforward code and you can see. > : > :-Alfred > > 'zero copy' is actually misnomer. What you are describing is really > 1-copy because you are using the resources of the PCI bus. A card I think the term means that the CPU doesn't have to do any copying, which is what you are describing no? -Alfred To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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