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MX6Q SATA read speed gets worse in linux 3.14.52_1.1.0 BSP

Question asked by Apollo Chang on Mar 18, 2016
Latest reply on Mar 21, 2016 by igorpadykov

Hi All,

 

 

SSD device is INTEL SSDSA2CT040G3.


 

The test commad i use on target board:

echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

 

Write test command:

dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fsync

 

Read test command:

dd if=tempfile of=/dev/null bs=1M count=1024

 

Test Result: (Rootfs is buildroot)

linux 3.14.52:

Write:

1073741824 bytes (1.0GB) copied, 26.856296 seconds, 38.1MB/s

Read:

1073741824 bytes (1.0GB) copied, 13.097736 seconds, 78.2MB/s

 

linux 3.10.53:

Write:

1073741824 bytes (1.0GB) copied, 28.990223 seconds, 35.3MB/s

Read:

1073741824 bytes (1.0GB) copied, 8.182314 seconds, 125.1MB/s

 

linux 3.0.35:

Write:

1073741824 bytes (1.0GB) copied, 36.756555 seconds, 27.9MB/s

Read:

1073741824 bytes (1.0GB) copied, 10.264888 seconds, 99.8MB/s

 

As you see, the read speed is 30% worse in linux 3.14.52 then linux 3.10.53.

Any idea ?

 

Is Any patch code for SATA performance improve ?

 

 

Apollo Chang

 

 

 

 

 

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