netdev - Re: [PATCH 1/1] Defer skb allocation for both mergeable buffers and big packets in virtio

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Date:	Wed, 25 Nov 2009 10:45:02 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Shirley Ma <mashirle@...ibm.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Avi Kivity <avi@...hat.com>, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hollis Blanchard <hollisb@...ibm.com>
Subject: Re: [PATCH 1/1] Defer skb allocation for both mergeable buffers and big packets in virtio_net

On Wed, 25 Nov 2009 01:06:32 am Anthony Liguori wrote:
> So does lguest.  It's been that way since the beginning.  Fixing this 
> would result in breaking older guests.

Agreed, we can't "fix" it in the guests, but it's a wart.  That's why I
haven't bothered fixing it, but if someone else wants to I'll cheer all the
way.

lguest did it because I knew I could fix lguest any time; it was a bad mistake
and I will now fix lguest :)

> We really need to introduce a feature bit if we want to change this.

I don't think it's worth it.  But the spec does say that the implementation
should not rely on the framing (I think there's a note that current
implementations are buggy tho, so you should frame it separately anyway).

That way future devices can get it right, at least.

Thanks,
Rusty.
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