We have a computer (running Windows 10) with five Ethernet ports (each 1 Gb), two of them are built-in, the other three are on two PCIe cards. Four of the Ethernet ports have in total six cameras plugged into them (with two switches, so no port handles more than two cameras at once). The system was originally designed to run distributed over several computers because the cameras send uncompressed images, so there is a service running (originally on each computer) that grabs the frames and hands them over to a recording/display program (now in a compressed format).
On the other hand, when looking at the service handling the incoming traffic, I see 99% usage (it was 100% but I set all cards to gigabit full duplex, then it dropped to 99%) while the actual usage is pretty much the sum of the four incoming traffics (headers in order: CPU, memory, network, disk, GPU):
As you can see, memory and CPU usage is very low, and the 800 Mb/s speed should be WAY below the capacity of the network, yet it shows 100% and the capturing program functions as if it were having serious bandwidth issues. Downscaling to four cameras (and around 600 Mb/s total) restores behaviour.
The strangest thing of all, is that for a few trials the six cameras in total were working perfectly, so my feeling is that Windows 10 is somehow thinking we only have 1000 Mb/s bandwidth and is trying to limit usage which somehow kicked in later.
What am I missing?
Motherboard: GA-X99-Designare EX
Devices listed in device manager:
- Intel Ethernet Connection (2) I218-V
- Intel I211 Gigabit Network Connection
- Intel PRO/1000 PT Dual Port Server Adapter
- Intel PRO/1000 PT Dual Port Server Adapter #2
- Realtek PCIe GBE Family Controller
Two PCIe NICs:
- TP LINK TG-3468
- GigE Card PCIe Intel PRO/1000 PT Dual Port Server Adapter
The interface statuses:
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed ---- -------------------- ------- ------ ---------- --------- Ethernet Intel(R) I211 Gigabit Network Connec... 12 Up 1C-1B-0D-6C-A0-27 1 Gbps Ethernet 2 Intel(R) Ethernet Connection (2) I218-V 15 Up 1C-1B-0D-6C-A0-29 1 Gbps Slot04 x16 Realtek PCIe GBE Family Controller 14 Up 18-D6-C7-01-C9-F6 100 Mbps Ethernet 4 Intel(R) PRO/1000 PT Dual Port Ser...#2 9 Up 68-05-CA-3F-CB-32 1 Gbps Ethernet 3 Intel(R) PRO/1000 PT Dual Port Serve... 20 Up 68-05-CA-3F-CB-33 1 Gbps
It seems that the Realtek GBE (which should be the TP LINK TG-3468, which says it can do 1 Gbps) is on 100 Mbps. It's connected with a Cat5e cable to a gigabit switch. I'm not sure this is relevant, but also seems strange.