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