I have made some quick benchmarks of my SD card on my Raspberry PI.
ionice -c 1 nice --20 hdparm -tT /dev/mmcblk0 /dev/mmcblk0: Timing cached reads: 280 MB in 2.00 seconds = 139.69 MB/sec Timing buffered disk reads: 32 MB in 3.13 seconds = 10.23 MB/sec
cat /sys/block/sda/queue/scheduler noop [deadline] cfq ./seeker /dev/mmcblk0 Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html Benchmarking /dev/mmcblk0 [15193MB], wait 30 seconds 295223396 .............................. Results: 409 seeks/second, 2.443 ms random access time
for i in {1..32} ; do dd if=/dev/zero of=space.$i.4GiB.out bs=1M count=4096 ; done
4096+0 records in
4096+0 records out
4294967296 bytes (4.3 GB) copied, 802.682 s, 5.4 MB/s
^C902+0 records in
902+0 records out
945815552 bytes (946 MB) copied, 169.609 s, 5.6 MB/s
ionice -c 1 nice --20 bonnie++ -u root
Using uid:0, gid:0.
Writing a byte at a time...done
Writing intelligently...done
Rewriting...done
Reading a byte at a time...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version 1.96 ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
raspberrypi 1G 47 98 5095 7 3618 7 349 99 12698 11 485.6 56
Latency 472ms 13531ms 8527ms 37039us 47144us 56047us
Version 1.96 ------Sequential Create------ --------Random Create--------
raspberrypi -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2752 63 +++++ +++ 4110 60 2599 58 +++++ +++ 4003 60
Latency 14651us 8503us 5143us 6866us 394us 3927us
1.96,1.96,raspberrypi,1,1363919597,1G,,47,98,5095,7,3618,7,349,99,12698,11,485.6,56,16,,,,,2752,63,+++++,+++,4110,60,2599,58,+++++,+++,4003,60,472ms,13531ms,8527ms,37039us,47144us,56047us,14651us,8503us,5143us,6866us,394us,3927us