Re: [net-next RFC] pktgen: don't wait for the device who doesn'tfree skb immediately after sent

[Stephen Hemminger]

On Mon, 26 Nov 2012 15:56:52 +0800
Jason Wang <jasowang@xxxxxxxxxx> wrote:

> Some deivces do not free the old tx skbs immediately after it has been sent
> (usually in tx interrupt). One such example is virtio-net which optimizes for
> virt and only free the possible old tx skbs during the next packet sending. This
> would lead the pktgen to wait forever in the refcount of the skb if no other
> pakcet will be sent afterwards.
> 
> Solving this issue by introducing a new flag IFF_TX_SKB_FREE_DELAY which could
> notify the pktgen that the device does not free skb immediately after it has
> been sent and let it not to wait for the refcount to be one.
> 
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>

Another alternative would be using skb_orphan() and skb->destructor.
There are other cases where skb's are not freed right away.
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