Enabling debugging

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7.1 LPAR mode z/VM guest KVM guest

The mlx4 device driver can be configured with a kernel configuration option for debugging.

About this task

Debugging for the mlx4 device driver is only available if the device driver is compiled with the kernel-configuration menu option CONFIG_MLX4_DEBUG.

Procedure

  1. Check that the device driver has the CONFIG_MLX4_DEBUG option enabled.
  2. Load the mlx4 modules with the sysfs parameter debug_level=1 to write debug messages to the syslog.
    Check the value of the debug_level parameter . If the parameter is set to 0, you can set it to 1 with the following command:
    echo 1 > /sys/module/mlx4_core/parameters/debug_level