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Date:      Thu, 22 Dec 2016 13:13:33 +0300
From:      "Andrey V. Elsukov" <bu7cher@yandex.ru>
To:        Harry Schmalzbauer <freebsd@omnilan.de>, freebsd-virtualization@freebsd.org
Subject:   Re: Jumbo frames truncated at 4084 bytes by virtio-net? (using if_bridge(4) and vtnet(4) with mtu 9000)
Message-ID:  <9b7951c0-9466-2b89-84de-c1026ee8f1c0@yandex.ru>
In-Reply-To: <585AA902.50907@omnilan.de>
References:  <585AA902.50907@omnilan.de>

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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



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