netdev - Re: [PATCH 02/11] net: add function to allocate skbuff head without data area

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Message-ID: <1315123938.2635.1.camel@edumazet-laptop>
Date:	Sun, 04 Sep 2011 10:12:18 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	kaber@...sh.net
Cc:	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 02/11] net: add function to allocate skbuff head
 without data area

Le samedi 03 septembre 2011 à 19:26 +0200, kaber@...sh.net a écrit :

> +struct sk_buff *__alloc_skb_head(gfp_t gfp_mask, int node)
> +{
> +	struct sk_buff *skb;
> +
> +	/* Get the HEAD */
> +	skb = kmem_cache_alloc_node(skbuff_head_cache,
> +				    gfp_mask & ~__GFP_DMA, node);
> +	if (!skb)
> +		goto out;
> +	prefetchw(skb);

Please remove this prefetchw(), since we have no delay between it and
actual memset(skb).

> +
> +	/*
> +	 * Only clear those fields we need to clear, not those that we will
> +	 * actually initialise below. Hence, don't put any more fields after
> +	 * the tail pointer in struct sk_buff!
> +	 */
> +	memset(skb, 0, offsetof(struct sk_buff, tail));



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