Hello,
I have a CRS312-4C+8XG https://mikrotik.com/product/crs312_4c_8xg_rm
Using RouterOS version 6.49.6. No queues or firewall rules. Plain switching.
PC connected via cooper 10 Gbps to it. ( 5 meters )
NAS connected via cooper 10 Gbps to it ( 1 meter )
Problem
When connecting a 1 Gbps client to this switch and try to download something from my PC ( 10 Gbps ), I get horrible speeds, fluctuating between 60 Mbps and 100 Mbps. I would say a median of ~75 Mbps downloading single large files.
When downloading/uploading between my PC ( 10 Gbps ) and my NAS ( 10 Gbps ) the speed is decent at around 5 Gbps and close to 8.5 Gbps using iperf3. My NAS is limited by its CPU.
Downloading from my PC ( 10 Gbps ) to a 1 Gbps client.
Downloading from my PC ( 1 Gbps forced from WinBox ) to a 1 Gbps client
Downloading from my PC ( 1 Gbps ) to a 1 Gbps client via a 1 Gbps switch ( not Mikrotik )
Using the same cables for all tests.
CPU on CRS312-4C+8XG barely used.
Repeated the tests numerous times and 100% is not a fluke.
Found some posts mentioning this issue but could not find a fix also.
Anyone experienced this and able to pinpoint the cause?
Thank you.
