netdev - Re: [PATCH net-next-2.6] sfc: Reduce size of efx_rx

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Message-Id: <20110301.130858.260088073.davem@davemloft.net>
Date:	Tue, 01 Mar 2011 13:08:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	linux-net-drivers@...arflare.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] sfc: Reduce size of efx_rx_buffer by
 unionising skb and page

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Tue, 01 Mar 2011 20:47:04 +0000

> Combining the flag with the pointers wouldn't improve on this:

Good point, but:

1) One less load in your RX fast path.

2) 32-bits of space for any addition state you might like to add later
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