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Date: Tue, 03 Dec 2013 16:36:02 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Alexei Starovoitov <ast@...mgrid.com> Cc: Or Gerlitz <or.gerlitz@...il.com>, David Miller <davem@...emloft.net>, Joseph Gasparakis <joseph.gasparakis@...el.com>, Jerry Chu <hkchu@...gle.com>, Or Gerlitz <ogerlitz@...lanox.com>, Eric Dumazet <edumazet@...gle.com>, Pravin B Shelar <pshelar@...ira.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: vxlan/veth performance issues on net.git + latest kernels On Tue, 2013-12-03 at 16:26 -0800, Alexei Starovoitov wrote: > > Could you use some other way to mark skb ? I could ;) > In tracing we might want to examine skb more carefully and not being > able to see the device > will limit the usability of this tracepoint. Unfortunately, using skb->dev as a pointer to device would be buggy or expensive (you would need to take a reference on device in order not letting it disappear, as we escape RCU protection) Current TRACE_EVENT for trace_consume_skb() does not use skb->dev. Anyway, this magic is pretty easy to change, I am open to suggestions. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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