Software RAID5 archived ~37 MB/sec resync speed with two pieces of 3ware 9550SX-8LP

# mdadm -Cv /dev/md7 -l5 -n15 -x1 -c128 /dev/sd[c-r]1
Personalities : [raid1] [raid5]
md7 : active raid5 sdq1[15] sdr1[16](S) sdp1[13] sdo1[12] sdn1[11] sdm1[10] sdl1[9] sdk1[8] sdj1[7] sdi1[6] sdh1[5] sdg1[4] sdf1[3] sde1[2] sdd1[1] sdc1[0]
4102468608 blocks level 5, 128k chunk, algorithm 2 [15/14] [UUUUUUUUUUUUUU_]
[>....................] recovery = 0.6% (1908296/293033472) finish=131.1min speed=36998K/sec

3ware 9000 Storage Controller device driver for Linux v2.26.04.006.
Firmware FE9X 3.01.01.028, BIOS BE9X 3.01.00.024.