On Thu, Jan 31, 2013 at 1:42 PM, Andrew Bradford
<andrew@bradfordembedded.com> wrote:
Flashbench results for Micron MTFC2GMVEA-0M WT 2GB eMMC.
root@beaglebone:~/flashbench# head /sys/block/mmcblk1/device/* 2>/dev/null | grep -v ^$
==> /sys/block/mmcblk1/device/block <==
==> /sys/block/mmcblk1/device/cid <==
fe014e4d4d433032473a1158f1467f35
==> /sys/block/mmcblk1/device/csd <==
d04f01320f5a1393ffffffe38a4000e7
==> /sys/block/mmcblk1/device/date <==
07/2012
==> /sys/block/mmcblk1/device/driver <==
==> /sys/block/mmcblk1/device/enhanced_area_offset <==
18446744073709551594
==> /sys/block/mmcblk1/device/enhanced_area_size <==
4294967274
==> /sys/block/mmcblk1/device/erase_size <==
524288
==> /sys/block/mmcblk1/device/fwrev <==
0x0
==> /sys/block/mmcblk1/device/hwrev <==
0x0
==> /sys/block/mmcblk1/device/manfid <==
0x0000fe
==> /sys/block/mmcblk1/device/name <==
MMC02G
==> /sys/block/mmcblk1/device/oemid <==
0x014e
==> /sys/block/mmcblk1/device/power <==
==> /sys/block/mmcblk1/device/preferred_erase_size <==
4194304
==> /sys/block/mmcblk1/device/raw_rpmb_size_mult <==
0x1
==> /sys/block/mmcblk1/device/rel_sectors <==
0x1
==> /sys/block/mmcblk1/device/serial <==
0x1158f146
==> /sys/block/mmcblk1/device/subsystem <==
==> /sys/block/mmcblk1/device/type <==
MMC
==> /sys/block/mmcblk1/device/uevent <==
DRIVER=mmcblk
MMC_TYPE=MMC
MMC_NAME=MMC02G
MODALIAS=mmc:block
root@beaglebone:~/flashbench# cat /sys/kernel/debug/mmc1/* 2>/dev/null | grep -v ^$
52000000
clock: 52000000 Hz
vdd: 7 (1.65 - 1.95 V)
bus mode: 2 (push-pull)
chip select: 0 (don't care)
power mode: 2 (on)
bus width: 2 (4 bits)
timing spec: 1 (mmc high-speed)
signal voltage: 0 (3.30 V)
mmc1:
ctx_loss: 0:0
regs:
CON: 0x00000600
HCTL: 0x00000b06
SYSCTL: 0x000c0087
IE: 0x00000000
ISE: 0x00000000
CAPA: 0x06e10080
root@beaglebone:~/flashbench# dd if=/dev/zero of=/dev/mmcblk1 bs=1M count=256 oflag=direct
256+0 records in
256+0 records out
268435456 bytes (268 MB) copied, 46.5893 s, 5.8 MB/s
root@beaglebone:~/flashbench# dd if=/dev/mmcblk1 of=/dev/null bs=1M count=256 iflag=direct
256+0 records in
256+0 records out
268435456 bytes (268 MB) copied, 15.1334 s, 17.7 MB/s
root@beaglebone:~/flashbench# fdisk -l /dev/mmcblk1
Disk /dev/mmcblk1: 1920 MB, 1920991232 bytes
4 heads, 16 sectors/track, 58624 cylinders, total 3751936 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
root@beaglebone:~/flashbench# ./flashbench -a /dev/mmcblk1 --blocksize=1024 --count=100
align 536870912 pre 1.03ms on 1.48ms post 1.03ms diff 451µs
align 268435456 pre 1ms on 1.41ms post 1.01ms diff 403µs
align 134217728 pre 978µs on 1.44ms post 918µs diff 488µs
align 67108864 pre 932µs on 1.26ms post 782µs diff 407µs
align 33554432 pre 981µs on 1.35ms post 923µs diff 393µs
align 16777216 pre 988µs on 1.43ms post 992µs diff 442µs
align 8388608 pre 993µs on 1.44ms post 989µs diff 446µs
align 4194304 pre 904µs on 1.22ms post 740µs diff 398µs
align 2097152 pre 992µs on 1.44ms post 984µs diff 448µs
align 1048576 pre 989µs on 1.05ms post 991µs diff 57.4µs
align 524288 pre 989µs on 1.05ms post 992µs diff 62.4µs
align 262144 pre 743µs on 801µs post 746µs diff 56.4µs
align 131072 pre 986µs on 1.05ms post 992µs diff 59µs
align 65536 pre 983µs on 1.04ms post 987µs diff 54.7µs
align 32768 pre 982µs on 1.04ms post 985µs diff 58.6µs
align 16384 pre 953µs on 1ms post 937µs diff 55.3µs
align 8192 pre 742µs on 794µs post 738µs diff 54µs
align 4096 pre 979µs on 1.04ms post 985µs diff 57.5µs
align 2048 pre 982µs on 1.02ms post 982µs diff 41.3µs
## Looks like 2 MiB erase blocks
root@beaglebone:~/flashbench# ./flashbench /dev/mmcblk1 --open-au --erasesize=$[2*1024*1024] --blocksize=$[8*1024] --open-au-nr=1
2MiB 2.52M/s
1MiB 2.47M/s
512KiB 2.52M/s
256KiB 2.49M/s
128KiB 2.48M/s
64KiB 2.49M/s
32KiB 2.34M/s
16KiB 2.13M/s
8KiB 1.82M/s
root@beaglebone:~/flashbench# ./flashbench /dev/mmcblk1 --open-au --erasesize=$[2*1024*1024] --blocksize=$[8*1024] --open-au-nr=5
2MiB 4.49M/s
1MiB 3.84M/s
512KiB 4.42M/s
256KiB 4.34M/s
128KiB 4.23M/s
64KiB 4.14M/s
32KiB 3.34M/s
16KiB 1.22M/s
8KiB 927K/s
root@beaglebone:~/flashbench# ./flashbench /dev/mmcblk1 --open-au --erasesize=$[2*1024*1024] --blocksize=$[8*1024] --open-au-nr=6
2MiB 5.66M/s
1MiB 3.33M/s
512KiB 1.27M/s
256KiB 598K/s
^C
## 5 open-au non-random
root@beaglebone:~/flashbench# ./flashbench /dev/mmcblk1 --open-au --erasesize=$[2*1024*1024] --blocksize=$[8*1024] --open-au-nr=5 --random
2MiB 6.16M/s
1MiB 1.6M/s
512KiB 2.48M/s
256KiB 2.51M/s
128KiB 1.64M/s
64KiB 1.27M/s
32KiB 1.07M/s
16KiB 1.21M/s
8KiB 886K/s
root@beaglebone:~/flashbench# ./flashbench /dev/mmcblk1 --open-au --erasesize=$[2*1024*1024] --blocksize=$[8*1024] --open-au-nr=6 --random
2MiB 5.37M/s
1MiB 3.35M/s
512KiB 1.28M/s
256KiB 601K/s
128KiB 295K/s
^C
## 5 open-au in random, too
I expected better but this is a lower end eMMC from Micron.
-Andrew
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