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Message-ID: <adabpk985q9.fsf@cisco.com>
Date: Thu, 15 Oct 2009 00:40:46 -0700
From: Roland Dreier <rdreier@...co.com>
To: ddutile@...hat.com
Cc: Krzysztof Halasa <khc@...waw.pl>,
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
> Yeah, the std nomenclature is PCI-e not PCI-E.
To be pedantic: "PCIe" without the hyphen is correct, cf
http://www.pcisig.com/specifications/pciexpress/ (the web page, not any
member-only specs) -- "PCIe" is used many times there.
> Again, trying to generate output that relates
> to what devices are spec to run at: 2.5GHz or 5.0GHz links.
But the spec does not talk about rates in GHz but rather GT/s (since
PCIe is not clocked but rather uses a recovered embedded clock).
Matching the terminology of the PCIe spec by using GT/s really seems
best in terms of clarity, and describes the situation most exactly,
since by using GT/s one also sidesteps the issue of having the data rate
depend on the link width.
- R.
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