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Message-Id: <1474728139-9335-1-git-send-email-eric@nelint.com> Date: Sat, 24 Sep 2016 07:42:16 -0700 From: Eric Nelson <eric@...int.com> To: netdev@...r.kernel.org Cc: linux@....linux.org.uk, andrew@...n.ch, fugang.duan@....com, otavio@...ystems.com.br, edumazet@...gle.com, troy.kisky@...ndarydevices.com, davem@...emloft.net, u.kleine-koenig@...gutronix.de, Eric Nelson <eric@...int.com> Subject: [PATCH 0/3] net: fec: updates to align IP header 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. Eric Nelson (3): net: fec: remove QUIRK_HAS_RACC from i.mx25 net: fec: remove QUIRK_HAS_RACC from i.mx27 net: fec: align IP header in hardware drivers/net/ethernet/freescale/fec_main.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) -- 2.7.4
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