# nvmeadm getfeature [controller_name]

For example:

# nvmeadm getfeature SUNW-NVME-1

SUNW-NVME-1
        Command Arbitration:
                Arbitration Burst: 0
                Low Proirity Weight: 0
                Medium Priority Weight: 0
                High Priority Weight: 0
        Power State: 0
        Temperature Threshold: 358 Kelvin
        Time Limited Error Recovery: 0 of 100 milliseconds
        Number of I/O submission queues allocated: 30
        Number of I/O completion queues allocated: 30
        Interrupt Coalescing Aggregation Time: 0 of 100 micro seconds
        Interrupt Coalescing Configuration:
                Interrupt Vector: 0
                Coalescing Disable: NO
        Write Atomicity Required: YES