netdev - Re: [PATCH net-next 2/3] virtio-net: use per-receive queue page frag alloc for mergeable bufs

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Date:	Thu, 26 Dec 2013 14:00:58 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Michael Dalton <mwdalton@...gle.com>,
	Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	lf-virt <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH net-next 2/3] virtio-net: use per-receive queue page
 frag alloc for mergeable bufs

On Thu, 2013-12-26 at 23:37 +0200, Michael S. Tsirkin wrote:

> Interesting. But if we can't allocate a buffer how can we
> do network processing?

How typical NIC drivers handle this case ?

Answer : nothing special should happen, we drop incoming traffic,
and make sure the driver recovers properly. (like not NULL deref or
crazy things like that)

Why virtio_net should be different ?

> 
> If we can reproduce the problem, we can maybe move
> allocation out of napi disabled section, but then
> we'll need to add more locking.

More exactly, use appropriate locking ;)


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