Date: Thu, 13 Jan 2011 20:49:55 +0100 (CET) From: sthaug@nethelp.no To: rysto32@gmail.com Cc: freebsd-net@freebsd.org Subject: Re: Intel 10GBase-LR Ethernet card detected as 10GBase-SR Message-ID: <20110113.204955.41688285.sthaug@nethelp.no> In-Reply-To: <20110113.195806.74699536.sthaug@nethelp.no> References: <20110113.151652.104127547.sthaug@nethelp.no> <AANLkTim0VSQ-XnT=0_GFWRE8nVepczzNDtnM1e_m2Vur@mail.gmail.com> <20110113.195806.74699536.sthaug@nethelp.no>
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> > If it has an SFP+, won't the it be LR or SR depending on the type of > > SFP+ installed? > > The card is *sold* and *advertised* by Intel as a 10GBase-LR card. It > may well be the case that it would also work with a 10GBase-SR SFP+. > I don't have one of these lying around to test, unfortunately. But I > have indeed verified that the SFP+ in the card is a 1310 nm 10GBase-LR > unit (specifically it's a Finisar FTLX1471D3BCV). > > As such, I believe the ixgbe code should either set the card type as > 10GBase-LR (statically), since that's how the card is sold/delivered. > Or it should include code to read the optics type from the SFP+. Thinking about this some more - I see there are also SR variants of the same card: http://ark.intel.com/Product.aspx?id=39773 http://ark.intel.com/Product.aspx?id=39774 In which case reading the optics type from the SFP, or having some kind of config setting, is the only thing that makes sense IMHO. Having a 10GBase-LR card report 10GBase-SR is guaranteed to result in misunderstandings... Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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