netdev - "TCP: eth0: Driver has suspect GRO implementation, TCP performance may be compromised." message with "ethtool -K eth0 gro off"

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Date:   Thu, 2 Feb 2017 12:52:40 +0100
From:   Markus Trippelsdorf <markus@...ppelsdorf.de>
To:     netdev@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: "TCP: eth0: Driver has suspect GRO implementation, TCP performance
 may be compromised." message with "ethtool -K eth0 gro off"

Hi,

from time to time I see the following warning in my kernel log:

 TCP: eth0: Driver has suspect GRO implementation, TCP performance may be compromised.

This happens although I run "/usr/sbin/ethtool -K eth0 gro off" in my
local boot script. 
What is the warning trying to tell me?

-- 
Markus