netdev - Re: [PATCH net-next 3/3] tcp: better TCP_SKB_CB layout to reduce cache line misses

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Date:	Tue, 23 Sep 2014 02:09:27 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Paasch <christoph.paasch@...ouvain.be>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net-next 3/3] tcp: better TCP_SKB_CB layout to reduce
 cache line misses

On Tue, 2014-09-23 at 09:36 +0200, Christoph Paasch wrote:
> On 23/09/14 - 09:20:16, Christoph Paasch wrote:
> > Hello Eric,
...
> > doesn't also the tx-path relies on IPCB(skb) being memset to 0 (e.g., in
> > xfrm4_output or ip_options_build)
> 
> Crap, forget about ip_options_build. It is memcpy'ing into IPCB... Confused
> src with dest... :-)
> 
> Nevertheless, wouldn't there be a problem in xfrm4_output?

Hi Christoph.

I believe you're right. I'll include a memset() in v2.
 
Thanks !


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