On 09/24/2016 08:09 AM, Andy Duan wrote: > From: Eric Nelson <e...@nelint.com> Sent: Saturday, September 24, 2016 10:42 > PM >> To: netdev@vger.kernel.org >> Cc: li...@arm.linux.org.uk; and...@lunn.ch; Andy Duan >> <fugang.d...@nxp.com>; ota...@ossystems.com.br; >> eduma...@google.com; troy.ki...@boundarydevices.com; >> da...@davemloft.net; u.kleine-koe...@pengutronix.de; Eric Nelson >> <e...@nelint.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 > I will investigate the diff between 4.1 and 4.8. Thanks. >
Thanks. Note that I'm not sure if the difference is 4.1 vs. 4.8 or i.MX6UL vs. i.MX6Q. > Acked-by: Fugang Duan <fugang.d...@nxp.com> >
