On 2025-04-28 23:22:29 +0700 (+0700), Nguyễn Hữu Khôi wrote:
[...]
> It happened only with geneve and vxlan. I can get full bandwidth
> with vlan.
[...]

If you're seeing significant bandwidth reduction with encapsulated
virtual networks, you may be fragmenting and doubling the number of
frames needed. Make sure the MTU of the physical network is
sufficiently larger than the encapsulated MTU to account for the
encapsulation overhead.
--
Jeremy Stanley