We conducted read and write performance tests on the storage interface of the armsom sige7 development board. Here are the test results
1.eMMC
The eMMC of armsom sige7 runs in HS400 mode by default, with a working bit width of 8. Below is a simple test of the read and write speed of eMMC. Here, we take the example of reading and writing the ext4 file system.
Write test：
root@ArmSom-sige7:/userdata# dd bs=1M count=512 conv=fsync if=/dev/zero of=/dev/mmcblk0p8
记录了500+0 的读入
记录了500+0 的写出
536870912字节（537 MB，512 MiB）已复制，2.57913 s，208 MB/s
Read Test：
root@ArmSom-sige7:/userdata# dd bs=1M count=512 if=/dev/mmcblk0p8 of=/dev/null
记录了512+0 的读入
记录了512+0 的写出
536870912字节（537 MB，512 MiB）已复制，1.83596 s，292 MB/s
From the above, it can be seen that the write speed of eMMC is 208MB/s and the read speed is 292MB/s.
2. NVMe
The PCI Express interface is connected to an nvme solid-state drive, let’s take a look at the speed of the PCIe interface.
Write test:
fio --name=writetest --ioengine=sync --rw=write --bs=4k --numjobs=16 --size=1G --time_based --filename=/dev/nvme0n1
This example runs a read test using a 4KB block size, 16 concurrent jobs, and a total of 1GB of test data.
The obtained results are as follows:
Run status group 0 (all jobs):
WRITE: bw=9057MiB/s (9497MB/s), 566MiB/s-606MiB/s (594MB/s-635MB/s), io=16.0GiB (17.2GB), run=1690-1809msec
Disk stats (read/write):
nvme0n1: ios=155/11, merge=0/123, ticks=8/9, in_queue=16, util=2.12%
Read test:
fio --name=readtest --ioengine=sync --rw=read --bs=4k --numjobs=16 --size=1G --time_based --filename=/dev/nvme0n1
The obtained results are as follows:
Run status group 0 (all jobs):
READ: bw=12.4GiB/s (13.3GB/s), 792MiB/s-801MiB/s (830MB/s-840MB/s), io=16.0GiB (17.2GB), run=1278-1293msec
Disk stats (read/write):
nvme0n1: ios=8180/0, merge=0/0, ticks=3168/0, in_queue=3167, util=91.98%
Please note that the specific performance may vary depending on hardware, drivers, and testing conditions, but in most cases, test results only indicate whether the NVMe storage device is running well on the PCIe 3.0 x4 interface.
3.SDcard
Test the read rate of USB Disk
root@ArmSom-sige7:/mnt# dd if=/dev/zero of=/mnt/test bs=64K count=16K
记录了16384+0 的读入
记录了16384+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，0.990046 s，1.1 GB/s
root@ArmSom-sige7:/mnt# echo 3 > /proc/sys/vm/drop_caches
[11322.812777] bash (1592): drop_caches: 3
root@ArmSom-sige7:/mnt# dd if=/mnt/test of=/dev/null bs=4K count=256K
记录了262144+0 的读入
记录了262144+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，1.58247 s，679 MB/s
root@ArmSom-sige7:/mnt# echo 3 > /proc/sys/vm/drop_caches
[11628.633439] bash (1592): drop_caches: 3
root@ArmSom-sige7:/mnt# dd if=/mnt/test of=/dev/null bs=64K count=16K
记录了16384+0 的读入
记录了16384+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，11.4648 s，93.7 MB/s
root@ArmSom-sige7:/mnt# echo 3 > /proc/sys/vm/drop_caches
[11658.589146] bash (1592): drop_caches: 3
root@ArmSom-sige7:/mnt# dd if=/mnt/test of=/dev/null bs=128K count=8K
记录了8192+0 的读入
记录了8192+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，11.4525 s，93.8 MB/s
root@ArmSom-sige7:/mnt# echo 3 > /proc/sys/vm/drop_caches
[11681.603100] bash (1592): drop_caches: 3
root@ArmSom-sige7:/mnt# dd if=/mnt/test of=/dev/null bs=512K count=2K
记录了2048+0 的读入
记录了2048+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，9.78606 s，110 MB/s
Test the write speed of USB Disk
root@ArmSom-sige7:/# echo 3 > /proc/sys/vm/drop_caches
[11951.413375] bash (1592): drop_caches: 3
root@ArmSom-sige7:/# dd if=/dev/zero of=/mnt/test bs=4K count=256K
记录了262144+0 的读入
记录了262144+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，1.15849 s，927 MB/s
root@ArmSom-sige7:/# rm /mnt/test
root@ArmSom-sige7:/# sync
root@ArmSom-sige7:/# echo 3 > /proc/sys/vm/drop_caches
[11980.713875] bash (1592): drop_caches: 3
root@ArmSom-sige7:/# dd if=/dev/zero of=/mnt/test bs=64K count=16K
记录了16384+0 的读入
记录了16384+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，0.988565 s，1.1 GB/s
root@ArmSom-sige7:/# rm /mnt/test
root@ArmSom-sige7:/# sync
root@ArmSom-sige7:/# echo 3 > /proc/sys/vm/drop_caches
[12007.713823] bash (1592): drop_caches: 3
root@ArmSom-sige7:/# dd if=/dev/zero of=/mnt/test bs=128K count=8K
记录了8192+0 的读入
记录了8192+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，0.976208 s，1.1 GB/s
root@ArmSom-sige7:/# rm /mnt/test
root@ArmSom-sige7:/# sync
root@ArmSom-sige7:/# echo 3 > /proc/sys/vm/drop_caches
[12031.596496] bash (1592): drop_caches: 3
root@ArmSom-sige7:/# dd if=/dev/zero of=/mnt/test bs=512K count=2K
记录了2048+0 的读入
记录了2048+0 的写出
1073741824字节（1.1 GB，1.0 GiB）已复制，0.985029 s，1.1 GB/s
测试结果可能会受到多种因素的影响，包括设备的硬件规格、操作系统和驱动程序的配置等。