Date: Sun, 2 Mar 2008 16:11:28 +0100 (CET) From: Ingo Flaschberger <if@xip.at> To: Barney Cordoba <barney_cordoba@yahoo.com> Cc: net@freebsd.org Subject: Re: FBSD 1GBit router? Message-ID: <alpine.LFD.1.00.0803021604180.14402@filebunker.xip.at> In-Reply-To: <497111.42659.qm@web63905.mail.re1.yahoo.com> References: <497111.42659.qm@web63905.mail.re1.yahoo.com>
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Dear Bareney, >> And back to 1x is not fast enough: >> There are no 1gbit single port network cards that >> support more than 1 >> lane, even if you plug it into a 16 lane slot. >> (and I'm not talking about 10gbit cards; if you have >> 10gbit upstream you >> have enough $$ to buy good gear) > > Ok, well I've never seen a router with 1 port. I > thought we were talking about building a router? Have you ever read the link? Have you noticed that the axiomtek appliance has 7 gigabit ports? Each one connected with 1 lane pci-e? > The lack of PCIe cards is a good reason to consider a > PCIX machine. On the systems that we have, the 1x PCIe > ports are a lot slower than a PCI-X card in the slot. Perhaps, but: pci-x: 4gbit for the whole bus system. pci-e: 2gbit/lane > You need 4Gb/s of throughput to handle a gigablt > router. (1 GB/s full duplex times 2). 1x is 4Gb/s > maximum. In my view, you always need twice the > bandwidth on the bus to avoid contention issues. sample1: 3 pci-cards: card 1: 1x = 2gbit (dedicated) card 2: 1x = 2gbit (dedicated) card 3: 1x = 2gbit (dedicated) -------------------- sum: 6gbit (but the use only 3) sample2: 2 pci-x cards card 1: 4gbit (shared) card 2: 4gbit (shared) card 3: 4gbit (shared) --------------------- sum: 4gbit homework: calculate with 7 ports. Kind regards, Ingo Flaschberger
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