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Date: Thu, 15 Oct 2009 19:58:49 +0200 From: Krzysztof Halasa <khc@...waw.pl> To: ddutile@...hat.com Cc: Stefan Assmann <sassmann@...hat.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Jesse Barnes <jbarnes@...tuousgeek.org>, kaneshige.kenji@...fujitsu.com, matthew@....cx Subject: Re: GT/s vs Gbps for PCIe bus speed Don Dutile <ddutile@...hat.com> writes: >>> No matter how many lanes, or how the data is sent (long or short bursts), >>> the frequency rate is a constant. I'm not sure there is such thing as "frequency rate" (but English isn't my first language). Rate, yes - symbol rate, clock rate (not used here), code rate. Frequency is a clearly defined but different thing. > Frequency changing would require link re-synch. > This code is dealing w/steady-state frequency. Believe me or not, there is no single frequency on PCIe link. Google shows for example: http://www.home.agilent.com/upload/cmc_upload/All/PCIe_HighSpeedSymposiumDec2008.pdf See page 30, it's frequency spectrum for PCIe 3.0 but the idea is the same. Also note consistent use of "GT/s" to avoid confusion. > Again, trying to generate output that relates > to what devices are spec to run at: 2.5GHz or 5.0GHz links. That seems like wifi rather than PCIe. -- Krzysztof Halasa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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