Re: gso: Attempt to handle mega-GRO packets

Eric Dumazet
2013-11-07T02:02:51Z

On Thu, 2013-11-07 at 09:47 +0800, Herbert Xu wrote:

> Say the system is fragmented sufficiently that you'll end up with
> 0-order pages. In that case you'll only ever be able to coalesce
> two packets.

4K page will contain 2 frags and they will coalesce.

Performance will still be quite good.

We probably add a tweak, to not have any hole in this case.

>
> Real systems that run for more than a day do end up with seriously
> fragmented memory.

Sure, but having shallow skbs in the first place help quite a bit.

There is no perfect solution, unless of course you change virtio_net to
provide different queues, with different frag sizes.

Sort of what NIU driver uses.