Setting IB link speed.

[abali999]

How do I go about changing the rate of my QDR link from 40gbps to
10gbps.
Any advice is appreciated.

Here is what ibstat shows. Then I use
ibportstate 1 1 speed 1 to downgrade the link. But it doesn't seem to
have any effect. Running a two node switchless system with opensm.

root@abali-desktop:/home/abali# ibstat
CA 'mlx4_0'
CA type: MT26428
Number of ports: 2
Firmware version: 2.7.0
Hardware version: b0
Node GUID: 0x0002c9030008e3e2
System image GUID: 0x0002c9030008e3e5
Port 1:
State: Active
Physical state: LinkUp
Rate: 40
Base lid: 1
LMC: 0
SM lid: 1
Capability mask: 0x0251086a
Port GUID: 0x0002c9030008e3e3
Link layer: IB

[Ali Ayoub]

Check your command syntax: ibportstate <lid> <portnum> speed 1
Also, you will need to reset the other end to re-negotiate: ibportstate <lid> <portnum> reset

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