Obtaining QDIO performance statistics

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Use the QDIO performance statistics to obtain information of QDIO devices. These statistics apply to FCP devices and to qeth devices.

About this task

To look at these debug logs use the Linux™ file system debugfs, which must be mounted. See debugfs for details.

These statistics are located in <debugfs_mount>/qdio/<device_bus_id>/statistics where <debugfs_mount> is the mount point for debugfs and <device_bus_id> is the bus ID of an FCP or qeth device.

Procedure

  • To collect QDIO performance statistics for the device fc00, issue the command:
    # echo 1 > /sys/kernel/debug/qdio/0.0.fc00/statistics
  • To stop collecting QDIO performance statistics, issue: 
    # echo 0 > /sys/kernel/debug/qdio/0.0.fc00/statistics
  • To read the collected data, issue: 
    # cat /sys/kernel/debug/qdio/0.0.fc00/statistics

What to do next

After you collect the appropriate diagnostic data, you can complete the following tasks: