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idata
Community Manager
971 Views

Actual Rate for Single-Port 10GBASE-LR is x4 instead of x8

We are using the EXPX9501AFXLR (Single-Port 10GBASE-LR) connected to x8 slot. its nominal rate is 2.5GTps but the maximum achivable rate is 6Gbps! lspci command says that the available rate is x4! What's wrong then?

1 Reply
Mark_H_Intel
Employee
54 Views

The Intel® 10 Gigabit XF SR Server Adapter is capable of x8, but will work in a slot that is mechanically x8 and electrically x4. If you are negotiating 4 lanes on the bus, then your system is limiting the adapter to 4 lanes.

Depending on how you set up your speed test, you might be encountering other bottlenecks. Take a look athttp://www.intel.com/support/network/sb/CS-025829.htm Network adapter throughput performance considerations for starters. I hope this helps.

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