How to change speed from FDR to QDR using ibportstate command in centos 6.2

We have Mellanox Infiniband FDR cards and cables supporting it. We want to reduce the speed of the adapters from 56 Gbps to 40 Gbps. We tried using ibportstate of the node. However, it does not help. Please let me know the exact sequence of commands to do so.

Card :

Mellanox Tech. MT27500 Family [ConnectX-3]

Switch : Mellanox 6536 Switch

ibportstate fdr10 0 espeed 30

ibportstate reset

Hi,

Thanks for the help, however, unfortunately this didn’t help.

Without firing command:

CA PortInfo:

Port info: Lid 144 port 1

LinkState:…Active

PhysLinkState:…LinkUp

Lid:…144

SMLid:…442

LMC:…0

LinkWidthSupported:…1X or 4X

LinkWidthEnabled:…1X or 4X

LinkWidthActive:…4X

LinkSpeedSupported:…2.5 Gbps or 5.0 Gbps or 10.0 Gbps

LinkSpeedEnabled:…2.5 Gbps or 5.0 Gbps or 10.0 Gbps

LinkSpeedActive:…10.0 Gbps

LinkSpeedExtSupported:…14.0625 Gbps

LinkSpeedExtEnabled:…14.0625 Gbps

LinkSpeedExtActive:…14.0625 Gbps

Extended Port info: Lid 144 port 1

StateChangeEnable:…0x00

LinkSpeedSupported:…0x01

LinkSpeedEnabled:…0x01

LinkSpeedActive:…0x00

After firing the above mentioned commands, i.e.

ibportstate 144 1 fdr10 0 espeed 30

ibportstate 144 1 reset

We get below output

CA PortInfo:

Port info: Lid 144 port 1

LinkState:…Active

PhysLinkState:…LinkUp

Lid:…144

SMLid:…442

LMC:…0

LinkWidthSupported:…1X or 4X

LinkWidthEnabled:…1X or 4X

LinkWidthActive:…4X

LinkSpeedSupported:…2.5 Gbps or 5.0 Gbps or 10.0 Gbps

LinkSpeedEnabled:…2.5 Gbps or 5.0 Gbps or 10.0 Gbps

LinkSpeedActive:…10.0 Gbps

LinkSpeedExtSupported:…14.0625 Gbps

LinkSpeedExtEnabled:…14.0625 Gbps

LinkSpeedExtActive:…14.0625 Gbps

Extended Port info: Lid 144 port 1

StateChangeEnable:…0x00

LinkSpeedSupported:…0x01

LinkSpeedEnabled:…0x00

LinkSpeedActive:…0x00

Can you please help ?

CA ‘mlx4_0’

CA type: MT4099

Number of ports: 1

Firmware version: 2.30.8000

Hardware version: 0

Node GUID: 0x0002c903001f69e0

System image GUID: 0x0002c903001f69e3

Port 1:

State: Active

Physical state: LinkUp

Rate: 56

Base lid: 144

LMC: 0

SM lid: 442

Capability mask: 0x02514868

Port GUID: 0x0002c903001f69e1

Link layer: InfiniBand