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

[Markus Trippelsdorf]

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