January 17, 20233 yr Hello there, I have been doing some Lan test this week and found something weird. After using some dockers in Unraid to test Lan speed (SpeedTest-By-OpenSpeedTest and another one), I found that my "Download" speed is capped to 1Gbps when my "Upload" speed is around 2.5 Gbps. This is my actual setup: - Unraid server running on a B550 mobo with the Realtek 2.5Gb Lan running at 2.5 full duplex. - Main desktop with Marvell AQC111C (5GbE running at 2.5 full duplex). - Secondary desktop with the infamous Intel 1225-v running at 2.5 full duplex. - Everything connected to a 2.5 GbE switch. - Switch connected to the router for internet. - Everything is showing 2.5 Gbps software side. I don't understand, since I am on a 2.GbE setup, I think my speed should be 2.5GbE both ways, I don't know if it's related to hardware or software. What do you think? Any solution? Is it normal?! Thank you for reading. Edited January 17, 20233 yr by Reda.Saiko
January 17, 20233 yr Community Expert Run a single stream iperf test in both directions to check LAN.
January 17, 20233 yr Author 9 minutes ago, JorgeB said: Run a single stream iperf test in both directions to check LAN. I have been trying to do this but I really don't know how to, any useful link that shows the process? This will help a lot.
January 17, 20233 yr Start an iperf server with iperf -s to create a server and then run iperf -c <serverIP> on the client.
January 18, 20233 yr Author 19 hours ago, nomisco said: Start an iperf server with iperf -s to create a server and then run iperf -c <serverIP> on the client. Done, these are the results. PC SIDE SERVER SIDE
January 18, 20233 yr Community Expert That confirms it's a LAN problem, and it's a know issue with some Realtek NICs, they are only fast in one direction. https://forums.unraid.net/topic/123594-poor-ssd-cache-read-speed-25gbe/
January 18, 20233 yr Author 1 hour ago, JorgeB said: That confirms it's a LAN problem, and it's a know issue with some Realtek NICs, they are only fast in one direction. https://forums.unraid.net/topic/123594-poor-ssd-cache-read-speed-25gbe/ Wow, Intel 2.5GbE NIC is faulty (every model, even the V3 with the pretended hardware fix...isn't fixed) and Realtek one have this issue. So I just have to forget about any motherboard native 2.5 NIC and get myself a PCIe card like the Intel X540? In the other topic the solution is: But I don't relaly dunerstand the subnet part, I will try now with the bridging disabled to see it it works.
January 18, 20233 yr Curious if you try a full duplex socket (supported by iperf 2) Use iperf -c dst -i 1 --full-duplex (man page here) --full-duplex run a full duplex test, i.e. traffic in both transmit and receive directions using the same socket
January 20, 20233 yr Author On 1/18/2023 at 9:01 PM, Robert McMAhon said: Curious if you try a full duplex socket (supported by iperf 2) Use iperf -c dst -i 1 --full-duplex (man page here) --full-duplex run a full duplex test, i.e. traffic in both transmit and receive directions using the same socket I will try this and update. For now I have been able to get 2.5gbps download by deactivating bridging, but my VMs are left without LAN (using an USB Wifi for now).
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