How to Set the Debug Drive Parameter Dynamically

The Linux hxge driver’s message logging can be statically specified via the debug driver configuration parameter. See Table 7. This will set the messaging level when the driver is initially loaded into memory and initializes itself. This message level remains in effect until the driver is unloaded or dynamically overridden. The debug configuration parameter can only be specified when the driver is first loaded into kernel memory.

In addition to the static debug driver configuration parameter, the currently-running Linux hxge driver’s message logging can be dynamically controlled via the ethtool(8) utility, using the -s switch.

1. To set the debug driver configuration parameter dynamically, use the following command:

   ethtool -s ethn msglvl parametervalue

   For example, still using eth2 as in previous examples, to dynamically turn on debug messaging in the currently-running hxge driver, use the command:

   ethtool eth2 -s msglvl 0x2001

   and to dynamically turn debug messaging back off again, leaving only error messages to be logged, use the command:

   ethtool eth2 -s msglvl 2002

2. Configure the syslog parameter. See How to Configure the Syslog Parameter.