On Tue, Oct 27, 2020, 02:49 Strahil Nikolov via Users <users(a)ovirt.org>
I would like to learn more about OVN and especially the maximum MTU that I
can use in my environment.
Current Setup 4.3.10
Network was created via UI -> MTU Custom -> 8976 -> Create on External
Provider -> Connect to Physical Network
So my physical connection is MTU 9000 and I have read that Geneve uses 24
bits (maybe that's wrong ?) , thus I have reduced the MTU to 8976.
From the internet draft it seems that the tunnel header + reserved bits
comprise 64 bits. A common practice for Geneve implementations is to use
8900 mtu for VMs when having 9000 mtu physical network.
I did some testing on the VMs and ping with payload of '8914' was the
maximum I could pass without fragmenting and thus the MTU on the VMs was
set to 8942.
Did I correctly configure the test network's MTU and am I understanding it
correctly that we need extra 34 bits inside the network for encapsulation ?
I have checked
but I don't see any refference how to calculate the max MTU.
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