netdev - Re: [RFC PATCH v7 08/19] Make __alloc

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Message-ID: <1275749604.5238.239.camel@edumazet-laptop>
Date:	Sat, 05 Jun 2010 16:53:24 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	xiaohui.xin@...el.com
Cc:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	davem@...emloft.net, herbert@...dor.apana.org.au,
	jdike@...ux.intel.com
Subject: Re: [RFC PATCH v7 08/19] Make __alloc_skb() to get external buffer.

Le samedi 05 juin 2010 à 18:14 +0800, xiaohui.xin@...el.com a écrit :
> From: Xin Xiaohui <xiaohui.xin@...el.com>
> 	child->fclone = SKB_FCLONE_UNAVAILABLE;
>  	}
> +	/* Record the external buffer info in this field. It's not so good,
> +	 * but we cannot find another place easily.
> +	 */
> +	shinfo->destructor_arg = ext_page;
> +


Yes this is a big problem, its basically using a cache line that was not
touched before.


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