本文來源電子發燒友社區，作者：劉建華， 帖子地址：https://bbs.elecfans.com/jishu_2307426_1_1.html


掛載好了sata硬盤，這里做一下磁盤速度測試：
通過df -h命令查看磁盤情況：

# df -h
Filesystem                Size      Used Available Use% Mounted on
none                    344.4M         0    344.4M   0% /dev
/dev/mmcblk0p7            6.8G    501.0M      6.3G   7% /
tmpfs                   375.3M         0    375.3M   0% /dev/shm
tmpfs                   375.3M     12.0K    375.3M   0% /tmp
tmpfs                   375.3M    224.0K    375.1M   0% /run
/dev/sda5                78.4G     56.0M     74.3G   0% /mnt/sata
/dev/mmcblk0p1          191.6M      1.8M    175.7M   1% /extp

2、通過hdparm測試讀取速率
先測試sata硬盤的

# hdparm -tT /dev/sda5

/dev/sda5:
Timing buffer-cache reads:   420 MB in 0.51 seconds = 839503 kB/s
Timing buffered disk reads:  478 MB in 3.00 seconds = 163015 kB/s

cahce讀取840M/s，磁盤持續讀取163M/s。
再測一下開發板的：

# hdparm -tT /dev/mmcblk0p7

/dev/mmcblk0p7:
Timing buffer-cache reads:   414 MB in 0.50 seconds = 831310 kB/s
Timing buffered disk reads:  126 MB in 3.00 seconds = 42988 kB/s

cahce讀取830M/s，磁盤持續讀取43M/s。

2. 測試寫速度：

# time dd if=/dev/sda5 bs=1024 count=1000000 of=1Gb.file
1000000+0 records in
1000000+0 records out

real    0m44.173s
user    0m0.590s
sys     0m26.740s
# time dd if=/dev/mmcblk0p7 bs=1024 count=1000000 of=1Gb.file
1000000+0 records in
1000000+0 records out

real    0m52.214s
user    0m0.570s
sys     0m25.760s

寫入速度SSD為：44M/s,EMMC為：19.2M/s。
從測試結果來看，開發板的磁盤讀取與寫入與臺式機的性能差不多。