I have a server (OS:Centos7.6 aarch64) with a Mellanox ConnectX-4 network card.
The CX4 network card is on a Riser card with an extended PCIe signal line. So I wanna to know if the signal of CX4 is reliable.
Following is the information which maybe useful:
- Error count and BER information:
[root@localhost ~]# mlxlink -d /dev/mst/mt4115_pciconf0 -c
Operational Info
----------------
State : Active
Physical state : LinkUp
Speed : 100GbE
Width : 4x
FEC : Standard RS-FEC - RS(528,514)
Loopback Mode : No Loopback
Auto Negotiation : ON
Supported Info
--------------
Enabled Link Speed : 0xf8f1f0d3 (100G,50G,40G,25G,10G,1G)
Supported Cable Speed : 0xf8f1f0d3 (100G,50G,40G,25G,10G,1G)
Troubleshooting Info
--------------------
Status Opcode : 0
Group Opcode : N/A
Recommendation : No issue was observed.
Physical Counters and BER Info
------------------------------
Time Since Last Clear [Min] : 1715.4
Effective Physical Errors : 0
Effective Physical BER : 15E-255
Raw Physical BER : 3E-12
Raw Physical Errors Per Lane : 26711,0,0,9108
2.Link grade and eye information
[root@localhost ~]# mlxlink -d /dev/mst/mt4115_pciconf0 -e
Operational Info
----------------
State : Active
Physical state : LinkUp
Speed : 100GbE
Width : 4x
FEC : Standard RS-FEC - RS(528,514)
Loopback Mode : No Loopback
Auto Negotiation : ON
Supported Info
--------------
Enabled Link Speed : 0xf8f1f0d3 (100G,50G,40G,25G,10G,1G)
Supported Cable Speed : 0xf8f1f0d3 (100G,50G,40G,25G,10G,1G)
Troubleshooting Info
--------------------
Status Opcode : 0
Group Opcode : N/A
Recommendation : No issue was observed.
EYE Opening Info
----------------
Physical Grade : 3065, 3367, 4371, 2932
Height Eye Opening [mV] : 48, 53, 57, 37
Phase Eye Opening [psec] : 12, 14, 15, 10
I have the information but I don’t know how to understand it. Could those numbers tell me whether my CX4 is reliable or not?