netdev - Re: regression: UFO removal breaks kvm live migration

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Date:   Wed, 08 Nov 2017 21:58:23 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     willemdebruijn.kernel@...il.com, mkubecek@...e.cz,
        netdev@...r.kernel.org, mst@...hat.com, vyasevic@...hat.com,
        pbonzini@...hat.com
Subject: Re: regression: UFO removal breaks kvm live migration

From: Jason Wang <jasowang@...hat.com>
Date: Wed, 8 Nov 2017 21:53:27 +0900

> On 2017年11月08日 20:32, David Miller wrote:
>> From: Jason Wang <jasowang@...hat.com>
>> Date: Wed, 8 Nov 2017 17:25:48 +0900
>>
>>> On 2017年11月08日 17:08, Willem de Bruijn wrote:
>>>> That won't help in the short term. I'm still reading up to see if
>>>> there are
>>>> any other options besides reimplement or advertise-but-drop, such as
>>>> an implicit trigger that would make the guest renegotiate. It's
>>>> unlikely, but
>>>> worth a look..
>>> Yes, this looks hard. And even if we can manage to do this, it looks
>>> an overkill since it will impact all guest after migration.
>> Like Willem I would much prefer "advertise-but-drop" if it works.
> 
> This makes migration work but all guest UFO traffic will stall.

The idea is that the sender will resend and it will be smaller and
thus non-UFO.