Date: Sat, 17 May 1997 10:28:45 -0400 From: dennis <dennis@etinc.com> To: Tony Li <tli@jnx.com>, Bradley Dunn <bradley@dunn.org> Cc: isp@FreeBSD.ORG Subject: Re: interface card to connect 64k..256k to connect to internet Message-ID: <3.0.32.19970517102841.00b2d9e0@etinc.com>
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At 11:26 PM 5/16/97 -0700, Tony Li wrote: >bradley@dunn.org (Bradley Dunn) writes: > >> ASUS P6NP5 w/ 150-MHz Pentium Pro: $435 (5 PCI slots) >> Intel Etherexpress Pro 10/100 PCI: $79 >> >> Now the question of at what point this router will saturate the PCI bus is >> more interesting... > >That particular combination can't saturate it. In fact, even if you fill >the PCI bus with 4xT1 cards, you have plenty of bandwidth: > >4XT1 = 4x(1.5Mbpsx2) = 12Mbps >4 cards@12Mbps = 48Mbps >1x 10/100 = 100Mbps > >Total=148Mbps. PCI can (and does) deliver up to 500Mbps. Of course we were talking about 4 QUAD T1 cards, but you can do the math.... ISA can handle 6 T1 lines in practice...and worst case PCI is 8 times faster, usually MUCH better than that. The difference is that with ISA, it IS the limiting factor, with PCI, its the OS processing as you pps get very high that is the limiting factor. Dennis
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