netdev - Re: [PATCH net] gso: do GSO for local skb with size bigger than MTU

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Message-ID: <20141202173401.GB4126@redhat.com>
Date:	Tue, 2 Dec 2014 19:34:01 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	"Du, Fan" <fan.du@...el.com>, "'Jason Wang'" <jasowang@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"fw@...len.de" <fw@...len.de>, dev@...nvswitch.org,
	jesse@...ira.com, pshelar@...ira.com
Subject: Re: [PATCH net] gso: do GSO for local skb with size bigger than MTU

On Tue, Dec 02, 2014 at 05:09:27PM +0000, Thomas Graf wrote:
> On 12/02/14 at 01:48pm, Flavio Leitner wrote:
> > What about containers or any other virtualization environment that
> > doesn't use Virtio?
> 
> The host can dictate the MTU in that case for both veth or OVS
> internal which would be primary container plumbing techniques.

It typically can't do this easily for VMs with emulated devices:
real ethernet uses a fixed MTU.

IMHO it's confusing to suggest MTU as a fix for this bug, it's
an unrelated optimization.
ICMP_DEST_UNREACH/ICMP_FRAG_NEEDED is the right fix here.


> ivshmem would need it's own fix.
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