netdev - Re: XDP offload to hypervisor

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Date:   Tue, 24 Jan 2017 05:33:37 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     John Fastabend <john.fastabend@...il.com>, jasowang@...hat.com,
        john.r.fastabend@...el.com, netdev@...r.kernel.org,
        daniel@...earbox.net
Subject: Re: XDP offload to hypervisor

On Mon, Jan 23, 2017 at 05:02:02PM -0800, Alexei Starovoitov wrote:
> Frankly I don't understand the whole virtio nit picking that was happening.
> imo virtio+xdp by itself is only useful for debugging, development and testing
> of xdp programs in a VM. The discussion about performance of virtio+xdp
> will only be meaningful when corresponding host part is done.
> Likely in the form of vhost extensions and may be driver changes.
> Trying to optimize virtio+xdp when host is doing traditional skb+vhost
> isn't going to be impactful.

Well if packets can be dropped without a host/guest
transition then yes, that will have an impact even
with traditional skbs.

-- 
MST