[pve-devel] applied: [PATCH qemu-server master v2 1/4] migration: tell users to upgrade if nets-host-mtu is not supported

[Thomas Lamprecht]

On Tue, 09 Sep 2025 11:16:57 +0200, Fiona Ebner wrote:
> In Proxmox VE 9, the default behavior for VirtIO network devices is to
> inherit the MTU from the bridge. This means that most migrations are
> potentially problematic when the nets-host-mtu parameter is not set,
> see commit 20c91f7f ("migration: preserve host_mtu for virtio-net
> devices"). While setting the parameter could be avoided in some cases,
> the information what MTU the target node bridges have is not readily
> available. Upgrading is already required to avoid actual problematic
> cases, so just tell people to upgrade when the target does not support
> preserving the VirtIO-net MTU yet in all cases.
> 
> [...]

Applied, thanks!

[1/4] migration: tell users to upgrade if nets-host-mtu is not supported
      commit: 67d8d092b11c9c8dbb071f705977858416584989