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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