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.
Acked-by: Fugang Duan <fugang.d...@nxp.com>
