netdev - Re: vxlan/veth performance issues on net.git + latest kernels

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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.


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