From: Zumeng Chen <zumeng.c...@gmail.com> Date: Mon, 4 Dec 2017 11:22:02 +0800
> According to LS1021A RM, the value of PAL can be set so that the start of the > IP header in the receive data buffer is aligned to a 32-bit boundary. > Normally, > setting PAL = 2 provides minimal padding to ensure such alignment of the IP > header. > > However every incoming packet's 8-byte time stamp will be inserted into the > packet data buffer as padding alignment bytes when hardware time stamping is > enabled. > > So we set the padding 8+2 here to avoid the flooded alignment faults: > > root@128:~# cat /proc/cpu/alignment > User: 0 > System: 17539 (inet_gro_receive+0x114/0x2c0) > Skipped: 0 > Half: 0 > Word: 0 > DWord: 0 > Multi: 17539 > User faults: 2 (fixup) > > Also shown when exception report enablement ... > Signed-off-by: Zumeng Chen <zumeng.c...@gmail.com> Applied.
