Jumbo frames truncated at 4084 bytes by virtio-net? (using if_bridge(4) and vtnet(4) with mtu 9000)

[Andrey V. Elsukov]

On 21.12.2016 19:08, Harry Schmalzbauer wrote:
>  Hello,
>
> I'm having guest connectivity problems with jumbo frames.
>
> Since if_bridge(4) requires all interfaces to have the same MTU (and the
> uplink interface also handles iscsi traffic, which greatly benefits from
> jumbo frames), I
> 'ifconfig create vmnet0 mtu 9000'
>
> Now my problem is that I can't simply keep guest's mtu at 1500, since
> the host will send jumbo frames as answer wich never get through virtio-net.
>
> Does anybody have an idea how to fix/work arround?

This looks like the problem with mbufs bigger than PAGE_SIZE.
Do you see some denied requests in the `netstat -m` output?

-- 
WBR, Andrey V. Elsukov