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What is the "Current message level" of an interface that ethtool provides? E.g.

ethtool eth1 [Other stuff] Current message level: 0x00000014 (20)

What is the message level? What is message level 20?

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This is the level of 'debugging messages/data' from the driver.

It is not quite standardized. Some more documentation is available in Documentation/networking/netif-msg.txt in your kernel source folder.

You may be able to use ethtool to set the message level

ethtool -s eth1 msglvl [level]

Note that the levels may vary by driver and you should look these up for your specific driver. The mask in a hex (0x... form) or decimal input should be accepted.

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