i used the 32gb emmc running debain
➜ root@c2 ~ dd if=/dev/zero of=test1.tmp oflag=direct bs=1M count=1024
1024+0 Datensätze ein
1024+0 Datensätze aus
1073741824 Bytes (1,1 GB) kopiert, 8,87295 s, 121 MB/s
➜ root@c2 ~ dd if=test1.tmp of=/dev/null iflag=direct bs=1M
1024+0 Datensätze ein
1024+0 Datensätze aus
1073741824 Bytes (1,1 GB) kopiert, 8,57696 s, 125 MB/s
➜ root@c2 ~ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mmcblk0 179:0 0 29,1G 0 disk
├─mmcblk0p1 179:1 0 128M 0 part /media/boot
└─mmcblk0p2 179:2 0 28,9G 0 part /
➜ root@c2 ~ iozone -e -I -a -s 100M -r 4k -r 512k -r 16M -i 0 -i 1 -i 2
Iozone: Performance Test of File I/O
Version $Revision: 3.429 $
Compiled for 64 bit mode.
Build: linux
Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
Al Slater, Scott Rhine, Mike Wisner, Ken Goss
Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,
Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,
Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer,
Vangel Bojaxhi, Ben England, Vikentsi Lapa.
Run began: Wed Mar 23 18:19:20 2016
Include fsync in write timing
O_DIRECT feature enabled
Auto Mode
File size set to 102400 kB
Record Size 4 kB
Record Size 512 kB
Record Size 16384 kB
Command line used: iozone -e -I -a -s 100M -r 4k -r 512k -r 16M -i 0 -i 1 -i 2
Output is in kBytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 kBytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
random random bkwd record stride
kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
102400 4 21506 21871 10587 10589 10285 21568
102400 512 119884 119129 120658 120204 120285 117944
102400 16384 123984 124286 118559 118461 118260 121185
iozone test complete.