May 7, 20224 yr Hello everyone! I have a 2.5gb LAN in home but when I found some strange issues when testing the connection speed with iperf3: Running iperf3 as a server on my Unraid machine gives me full speed: ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- Accepted connection from 192.168.1.5, port 35508 [ 5] local 192.168.1.11 port 5201 connected to 192.168.1.5 port 35510 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 1.00-2.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 2.00-3.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 3.00-4.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 4.00-5.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 5.00-6.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 6.00-7.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 7.00-8.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 8.00-9.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 9.00-10.00 sec 280 MBytes 2.35 Gbits/sec [ 5] 10.00-10.00 sec 488 KBytes 2.25 Gbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate [ 5] 0.00-10.00 sec 2.74 GBytes 2.35 Gbits/sec receiver When I set Unraid to be the client, I got half of the expected speed: Connecting to host 192.168.1.5, port 5201 [ 5] local 192.168.1.11 port 58342 connected to 192.168.1.5 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 140 MBytes 1.17 Gbits/sec 668 294 KBytes [ 5] 1.00-2.00 sec 136 MBytes 1.14 Gbits/sec 0 294 KBytes [ 5] 2.00-3.00 sec 134 MBytes 1.12 Gbits/sec 0 291 KBytes [ 5] 3.00-4.00 sec 136 MBytes 1.14 Gbits/sec 0 297 KBytes [ 5] 4.00-5.00 sec 134 MBytes 1.12 Gbits/sec 0 294 KBytes [ 5] 5.00-6.00 sec 134 MBytes 1.12 Gbits/sec 0 303 KBytes [ 5] 6.00-7.00 sec 136 MBytes 1.14 Gbits/sec 0 297 KBytes [ 5] 7.00-8.00 sec 138 MBytes 1.15 Gbits/sec 0 294 KBytes [ 5] 8.00-9.00 sec 132 MBytes 1.11 Gbits/sec 0 297 KBytes [ 5] 9.00-10.00 sec 134 MBytes 1.12 Gbits/sec 0 303 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 1.32 GBytes 1.14 Gbits/sec 668 sender [ 5] 0.00-10.00 sec 1.32 GBytes 1.13 Gbits/sec receiver Tested with another iperf3 server returned the same result. The dashboard gives me 2500Mbps full duplex on network interface, since it's an onboard ethernet port I'm not able to switch the card for testing. My motherboard is ASUS TUF GAMING B550M-PLUS WIFI II if that helps... Could anyone help me to fix it, or any ideas to move forward on debugging this? Thanks for the help and thanks for reading
May 7, 20224 yr Community Expert If it's a Realtek NIC take a look below, though not quite clear what the fix was. https://forums.unraid.net/topic/122274-write-good-read-bad/
May 7, 20224 yr Author 16 hours ago, JorgeB said: If it's a Realtek NIC take a look below, though not quite clear what the fix was. https://forums.unraid.net/topic/122274-write-good-read-bad/ Thank you for reaching out. It is a Realtek NIC (I think it's Realtek's RTL8125B). Unfortunately updating BIOS and rebinding dhcp didn't help... Will try to do more search
June 5, 20224 yr I have the same issue of the download speed with Realtck 2.5g NIC. If I disable the bridging of the NIC. The download speed from Unraid goes back to normal (280 MB/s). But if I enable the bridging of the NIC, the speed becomes to half (140 MB/s) again. Should it be a bug of Unraid?
June 16, 20224 yr Author On 6/5/2022 at 11:26 PM, defender said: I have the same issue of the download speed with Realtck 2.5g NIC. If I disable the bridging of the NIC. The download speed from Unraid goes back to normal (280 MB/s). But if I enable the bridging of the NIC, the speed becomes to half (140 MB/s) again. Should it be a bug of Unraid? Oh my god you just saved my day! I turned off the bridging and it's now running at full speed both ways! Now my solution is to use a cheap USB ethernet dongle for bridging only to release the onboard 2.5Gb LAN. It seems the docker bridge won't effect the network speed on my machine, so it might because of something related to virtio-net? Edited June 16, 20224 yr by kenpuluma
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