netdev - Re: [PATCH net-next] net: more accurate skb truesize

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Message-ID: <1318525990.2745.33.camel@bwh-desktop>
Date:	Thu, 13 Oct 2011 18:13:10 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH net-next] net: more accurate skb truesize

On Thu, 2011-10-13 at 19:11 +0200, Eric Dumazet wrote:
> Le jeudi 13 octobre 2011 à 17:32 +0100, Ben Hutchings a écrit :
> 
> > Fair enough, but please add a comment explaining this.
> > 
> 
> 
> What about :
> 
> 	/* We do our best to align skb_shared_info on a separate cache
> 	 * line. It usually works because kmalloc(X > CACHE_BYTES) gives
> 	 * aligned memory blocks, unless SLUB/SLAB debug is enabled.
> 	 */
> 	size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));

Yes, that seems like a good explanation.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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