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

From: Markus Trippelsdorf <[email-masked]>
Date: Thu, 2 Feb 2017 12:52:40 +0100

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