netdev - Re: [PATCH 0/3] net: fec: updates to align IP header

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Message-Id: <20160927.074006.1952862778935087880.davem@davemloft.net>
Date:   Tue, 27 Sep 2016 07:40:06 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     eric@...int.com
Cc:     netdev@...r.kernel.org, linux@....linux.org.uk, andrew@...n.ch,
        fugang.duan@....com, otavio@...ystems.com.br, edumazet@...gle.com,
        troy.kisky@...ndarydevices.com, u.kleine-koenig@...gutronix.de
Subject: Re: [PATCH 0/3] net: fec: updates to align IP header

From: Eric Nelson <eric@...int.com>
Date: Sat, 24 Sep 2016 07:42:16 -0700

> This patch series is the outcome of investigation into very high
> numbers of alignment faults on kernel 4.1.33 from the linux-fslc
> tree:
>     https://github.com/freescale/linux-fslc/tree/4.1-1.0.x-imx
> 
> The first two patches remove support for the receive accelerator (RACC) from
> the i.MX25 and i.MX27 SoCs which don't support the function.
> 
> The third patch enables hardware alignment of the ethernet packet payload
> (and especially the IP header) to prevent alignment faults in the IP stack.
> 
> Testing on i.MX6UL on the 4.1.33 kernel showed that this patch removed
> on the order of 70k alignment faults during a 100MiB transfer using 
> wget.
> 
> Testing on an i.MX6Q (SABRE Lite) board on net-next (4.8.0-rc7) showed
> a much more modest improvement from 10's of faults, and it's not clear
> why that's the case.

Series applied and queued up for -stable.