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Linux - Networking This forum is for any issue related to networks or networking.
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Old 03-03-2014, 10:25 PM   #1
jquan
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Lnkcap lspci -vv output


My Network Card has the following settings:
http://www.emulex.com/products/fibre...pecifications/

Doubling the maximum Fibre Channel link rate from 8Gb to 16Gb and enhanced virtualization capabilities

I've had a look at my network card and its rated at:
LPE12002 8GB/S 2-PORT FC: PCI EXPRESS HBA DIAG OPTICS
So according to the specifications 8GB/s is correct as 8GB/s * 2 cards = 16GB/s

However looking at lspci -vv
Capabilities: [94] Express (v2)
LnkCap: Port #0, Speed 5GT/s, Width x8

Does that mean the on one port the card maximum supported speed is:
5GT/s = 4Gb(Gigabits) = 0.5GB/s Gigabytes
* Width x8 (Channels) = 4GB/s

So the maximum speed is 4GB/s * 2 ports = 8GB/s

Is that correct, or if not where am I going wrong?
 
Old 03-17-2014, 03:55 PM   #2
metaschima
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See:
http://en.wikipedia.org/wiki/Gigatransfer
5 GT/s * 8 bytes per transfer = 40 GB/s
 
  


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