netdev - Re: [net-next-2.6 PATCH 1/4] e1000e: save skb counts in TX to avoid cache misses

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Message-Id: <20100506.001934.212692803.davem@davemloft.net>
Date:	Thu, 06 May 2010 00:19:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, therbert@...gle.com,
	bruce.w.allan@...el.com
Subject: Re: [net-next-2.6 PATCH 1/4] e1000e: save skb counts in TX to
 avoid cache misses

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Wed, 05 May 2010 17:02:27 -0700

> From: Tom Herbert <therbert@...gle.com>
> 
> In e1000_tx_map, precompute number of segements and bytecounts which
> are derived from fields in skb; these are stored in buffer_info.  When
> cleaning tx in e1000_clean_tx_irq use the values in the associated
> buffer_info for statistics counting, this eliminates cache misses
> on skb fields.
> 
> Signed-off-by: Tom Herbert <therbert@...gle.com>
> Acked-by: Bruce Allan <bruce.w.allan@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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