0
I have an Intel 10Gbps card that has the 82599 10GbE Controller. The card has two ports in it. The datasheet of the controller says it supports PCIe 2.0 (2.5 GT/s or 5.0 GT/s)
Now, according to PCIe SIG's faq page (link: https://www.pcisig.com/news_room/faqs/pcie3.0_faq/#EQ3) says that for a 5.0 GT/s symbol rate PCIe gives an interconnect bandwidth of 4Gbps and a per lane per direction of 500MB/s)
I ran a netperf test on the card (I connected two of these cards via OFC back-to-back with no switches in-between) and the bandwidth of around 3.3Gbps (which is around 400MB/s)
Is my card under-utilized or does those numbers add up? Why wouldn't I get a full 10Gbps on the card (and only get 3.3Gbps)
(The card is x4 on an x8 slot)
Update: The network card goes to a slot that is configured as PCIe 3.0 and its an x8 slot (it supports upto 8.0 GT/s). And as to the board itself, well its a Freescale board (Processor: T4240). So I figured that board might be ok, with the card being slower of the two.
Thanks in advance.
What motherboard are you using and in which slots exactly are cards (including the network card) located? – Daniel B – 2014-09-08T15:17:47.170
You have this 10Gbps card connected to something. What is the specifications of that hardware? – Ramhound – 2014-09-08T15:29:35.810