Date: Thu, 22 Jun 1995 18:29:36 -0700 (PDT) From: Tom Samplonius <tom@uniserve.com> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: jkh@freebsd.org, evanc@synapse.net, hackers@freefall.cdrom.com Subject: Re: FreeBSD as a router Message-ID: <Pine.BSF.3.91.950622182452.5835B-100000@haven.uniserve.com> In-Reply-To: <199506230108.SAA09137@gndrsh.aac.dev.com>
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On Thu, 22 Jun 1995, Rodney W. Grimes wrote: > The bottleneck is that you have to wait for full frame reception > before you get an interrupt to tell you to go look at the header > to decide what to do with the packet. > > In dedicated router hardware they use the trick of interrupting > the CPU after N bytes have been recieved (N is programmable) so > they can actually decide what to do with the packet before it is > even completly received. A bit of extra delay shouldn't affect throughput, especially with TCP large window support, or does it? Can't PC ethernet cards also be handled in the same matter? Or are there none available with that feature? From looking in Netblazer ST around here, it appears to have a SMC ethernet card in it..... Tom
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