[SOLVED] Network stuck at 1G

RassK

New Member
Feb 7, 2025
2
0
1
Hi,

I'm running Proxmox on top of GENOAD8X-2TBCM which has built in Broadcom BCM57416. It's 2x10G NIC.
The other side is Mikrotik CRS328-24P-4S+

Whatever I do, I cannot get over ~950Mbps with Iperf3 hosted on that server. My Synology hosts similarly iperf3 on docker, so desktop <-> Syno gets 8G speed. Desktop <-> Epyc Server gets ~1G. Took out my direct 10M Cat6 cable I used to test 10G between Syno and desktop, so cable is good. Link speed is always negotiated 10G. Switched SFP+ modules with Synology, no effect.

I'm running out of ideas, where is the issue.

mikrotik: /interface ethernet monitor sfp-sfpplus1
Code:
name: sfp-sfpplus1
status: link-ok                                                                                    
auto-negotiation: done
rate: 10Gbps
name: sfp-sfpplus1                                                                                         
status: link-ok                                                                                    
auto-negotiation: done                                                                                                   
rate: 10Gbps
supported: 10M-baseT-half
                     10M-baseT-full
                     100M-baseT-half
                     100M-baseT-full                    
                     1G-baseT-half                 
                     1G-baseT-full                
                     1G-baseX                    
                     2.5G-baseT         
                     2.5G-baseX      
                     5G-baseT                  
                     10G-baseT           
                     10G-baseSR-LR                                      
                     10G-baseCR    
sfp-supported: 1G-baseT-full      
                            1G-baseX                                            
                            2.5G-baseT                                  
                            2.5G-baseX                            
                            5G-baseT                           
                            10G-baseCR                          
advertising: 10M-baseT-half    
                      10M-baseT-full                      
                      100M-baseT-half                               
                      100M-baseT-full                                
                      1G-baseT-half          
                      1G-baseT-full           
                      2.5G-seT                 
                      5G-baseT                        
                      10G-baseT       
link-partner-advertising: 100M-baseT-half
                                            100M-baseT-full             
                                            1G-baseT-half             
                                            1G-baseT-full                 
                                            10G-baseT
sfp-module-present: yes
sfp-rx-loss: no 
sfp-tx-fault: no  
sfp-type: SFP/SFP+/SFP28/SFP56 
sfp-connector-type: RJ45  
sfp-link-length-copper-active-om4: 1m
sfp-vendor-name: MikroTik
sfp-vendor-part-number: S+RJ10 
sfp-vendor-revision: 2.16
sfp-vendor-serial: AF940307F94A
sfp-manufacturing-date: 21-02-27
sfp-temperature: 80C 
sfp-supply-voltage: 3.264V 
sfp-tx-bias-current: 0mA         
eeprom-checksum: good
root@epyc:~# ethtool enp2s0f0np0
Code:
Settings for enp2s0f0np0:
        Supported ports: [ TP ]
        Supported link modes:   1000baseT/Full
                                10000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  1000baseT/Full
                                10000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Lanes: 1
        Duplex: Full
        Auto-negotiation: on
        Port: Twisted Pair
        PHYAD: 12
        Transceiver: internal
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: g
        Current message level: 0x00002081 (8321)
                               drv tx_err hw
        Link detected: yes
 
Was a simple VLAN misconfiguration (wrong VLAN ID and static IP), not sure how it worked at all.
 
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