netdev - Re: [Qemu-devel] [PATCH v3 0/3] Use of unique identifier for pairing virtio and passthrough devices...

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Date:   Tue, 10 Jul 2018 04:58:13 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     si-wei liu <si-wei.liu@...cle.com>
Cc:     Roman Kagan <rkagan@...tuozzo.com>,
        Venu Busireddy <venu.busireddy@...cle.com>,
        Marcel Apfelbaum <marcel@...hat.com>,
        virtio-dev@...ts.oasis-open.org, qemu-devel@...gnu.org,
        sridhar.samudrala@...el.com, alexander.h.duyck@...el.com,
        netdev@...r.kernel.org
Subject: Re: [Qemu-devel] [PATCH v3 0/3] Use of unique identifier for pairing
 virtio and passthrough devices...

On Mon, Jul 09, 2018 at 06:11:53PM -0700, si-wei liu wrote:
> What do we buy
> for using a random address during initial discovery and requiring VF to
> complete the handshake?

I don't see advantages to using a random address that is then
changed either: changing a MAC causes network downtime for most users.

> Less network downtime during datapath switching?
> Sorry but that's not a key factor at all for our main goal - live migration.

Isn't avoiding downtime what makes the migration "live"?
If you don't care about it at all just remove the device
and migrate without all these tricks.


-- 
MST