Re: [PATCH net-next 2/2] virtio-net: simplify XDP handling in small buffer

[Jason Wang]

On 2018å03æ01æ 17:15, Jesper Dangaard Brouer wrote:
> On Thu, 1 Mar 2018 16:49:24 +0800
> Jason Wang <jasowang@xxxxxxxxxx> wrote:
>
> > > 2. This can easily cause out-of-order packets.
> > I may miss something, but it looks to me packets were still delivered
> > in order? Or you mean the packets that was dropped by cpumap?
> No. Packets can now travel two code paths to the egress device. (1) XDP
> native via ndp_xdp_xmit via direct delivery into a lockfree/dedicated
> TX queue, (2) via normal network stack which can involve being queue in
> a qdisc.  Do you see the possibility of the reorder now?

I see, thanks. But consider this could only happen for first few 
packets, not sure it was worth to worry about it.

Thanks