Messages in this thread |  | | | Date | Fri, 27 Nov 2009 21:38:24 -0800 | | From | Stephen Hemminger <> | | Subject | Re: [PATCH 0/3] macvlan: support for guest vm direct rx/tx |
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On Fri, 27 Nov 2009 16:19:57 -0800 (PST) David Miller <davem@davemloft.net> wrote:
> From: Arnd Bergmann <arnd@arndb.de> > Date: Sat, 28 Nov 2009 00:43:58 +0100 > > > On Friday 13 November 2009, Stephen Hemminger wrote: > >> Also, macvlan should really being calling netif_receive_skb() > >> not going through another queue/softirq cycle. > > > > I've added a patch for this in my experimental queue now. > > When I last tried this, I saw a kernel stack overflow > > but it seems fine now. > > I think it is unwise for any virtual device layer to use netif_receive_skb(). > Just like tunnels they should always use netif_rx(). > > Otherwise stack overflow is a very real concern.
Maybe we should figure out a way for protocols to return new skb in netif_receive_skb to avoid extra softirq, but avoid stack overflow?
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