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- Join Date
- Sep 2008
Transmit rate decreases when using both Intel NIC 10G ports
I'm using the Intel 82599EB 10G NIC on a server running RHEL6. I ran a program where packets are generated at high rates. The NIC was previously installed on another PC where I was able to generate traffic at 8-9Gbps on each port concurrently. On this server, I was able to generate at 8-9Gbps only if one port is in use. If I were to generate on both ports concurrently, then my total transmit rate drops to about 12Gbps (~6Gbps on each port).
My relevant "lspci -vvv" output shows the following:
0b:00.0 Ethernet controller: ... Capabilities: [a0] Express (v2) Endpoint, MSI 00 LnkCap: Port #1, Speed 5GT/s, Width x8 LnkSta: Speed 5GT/s, Width x4 LnkCtl2: Target Link Speed: 5GT/s 0b:00.1 Ethernet controller: ... Capabilities: [a0] Express (v2) Endpoint, MSI 00 LnkCap: Port #1, Speed 5GT/s, Width x8 LnkSta: Speed 5GT/s, Width x4 LnkCtl2: Target Link Speed: 2.5GT/s
Also, I see a couple of PCIE slots that are longer than my NIC's PCIE connectors. Can I install my NIC on these longer slots instead?
- Join Date
- Jan 2007
Check the link speed on the nic .
Check if the link is 10gbps or 1 gbps and also check the duplex settings on both the switch and nic .