netdev - Re: [PATCH v2] b44: fix misalignment and wasted space in rx handling

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Message-Id: <20090109.230817.36393679.davem@davemloft.net>
Date:	Fri, 09 Jan 2009 23:08:17 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	nbd@...nwrt.org
Cc:	netdev@...r.kernel.org, mb@...sch.de
Subject: Re: [PATCH v2] b44: fix misalignment and wasted space in rx
 handling

From: Felix Fietkau <nbd@...nwrt.org>
Date: Fri, 09 Jan 2009 13:39:57 +0100

> Broadcom 4400 puts a header of configurable size (apparently needs
> to be at least 28 bytes) in front of received packets. When handling
> this, the previous code accidentally added the offset 30 *twice* for
> the software and once for the hardware, thereby cancelling out the
> IP alignment effect of the 30 byte padding and wasting an additional
> 30 bytes of memory per packet.
> 
> This patch fixes this problem and improves routing throughput by
> about 30% on MIPS, where unaligned access is expensive.
> 
> Signed-off-by: Felix Fietkau <nbd@...nwrt.org>

Applied.
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