netdev - Re: [PATCH 2/2] net: skb_shared

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Message-Id: <20090608.002231.101760669.davem@davemloft.net>
Date:	Mon, 08 Jun 2009 00:22:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] net: skb_shared_info optimization

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 05 Jun 2009 16:04:16 +0200

> skb_dma_unmap() is quite expensive for small packets, 
> because we use two different cache lines from skb_shared_info.
> 
> One to access nr_frags, one to access dma_maps[0]
> 
> Instead of dma_maps being an array of MAX_SKB_FRAGS + 1 elements,
> let dma_head alone in a new dma_head field, close to nr_frags,
> to reduce cache lines misses.
> 
> Tested on my dev machine (bnx2 & tg3 adapters), nice speedup !
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks.
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