Hello Thomas,
                       The following shows how to enable Ethtool

https://ovirt.org/documentation/admin-guide/appe-Custom_Network_Properties.html


Regards,
                Paul S.

________________________________________
From: tho...@hoberg.net <tho...@hoberg.net>
Sent: 19 August 2019 08:59
To: users@ovirt.org
Subject: [ovirt-users] Custum driver in oVirt node image?

Using 3 Mini-ITX Atoms J5005 boards to build a three node HC test environment 
(actually there is a fourth to simulate a remote DC)

These boards have a RealTek 8169 Gbit controller, which for hardware/firmware 
or driver reasons comes up just fine on cold boots, but struggles on warm-boots 
or whenever the interface is re-configured, as is the case when the OVS overlay 
is configured, ...

* unless link-speed autonegotiation is enabled

after which it works just fine.

So for a normal system, I can just put a proper ETHTOOL_OPTS="autoneg on" into 
/etc/sysconfig/network-scrkipts/ifcfg-<device-name> to avoid trouble on warm 
boots, but once the overlay network is put on top, the network manager no 
longer controls the device and the standard "ignore" setting of driver/hardware 
evidently causes the link to fail: dmesg reports the interface toggling and ovs 
isn't happy either.

The Ethernet switch is unmanaged, so there is nothing I can do there to speed 
up or eliminate negotiations, and I currently see three options:
1. Find/be told where to renable Ethernet link speed autonegotiation with the 
OVS/VDSM/?? so the RTL8169 is happy again
2. Use a known USB3 GBit NIC (no space in the chassis to put e.g. an Intel NIC)
3. Make an USB3 2.5Gbit NIC based on RealTek's 8156 work, but currently that 
requires compiling from source and loading it at boot

Option 3 works just fine with a CentOS base, but I got tons of problem making 
oVirt hosted engine work with that.
Option 3 for the oVirt node image seems to class with the read-only nature of 
the oVirt node imge: While I can load a pre-compile driver interactively, I 
can't make it stick with dracut -f.

I haven't immediately found a way to patch/fix/build derivative oVirt node 
images with that driver included and am somewhat to impatient to wait until 
it's mainstream, so any help would be appreciated.

I've verified option 2 with a single USB3 GBit adapter natively supported by 
the kernel that I already had available, but I then opted to jump the gun and 
buy the slightly more expensive 2.5GBit variant as a better match to a Gluster 
environment: A mistake in this context as it turned out.
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