topic Re: About difference in memory reading speed by the Android version for i.MX6 Quad. in i.MX Processors

About difference in memory reading speed by the Android version for i.MX6 Quad.

yuuki — Wed, 22 Jul 2015 13:08:45 GMT

Dear all,

We run Android BSP on MX6Quad SABRE-SDB board.

We noticed that memory reading speed was different between Android4 .4.2 and Android4 .4.3.

<Measurement result>
* Android4.4.2
eMMC Seq.Read=47.49MB/s, SD Seq Read=22.69MB/s

* Android4.4.3
eMMC Seq.Read=35.38MB/s, SD Seq Read=17.92MB/s

Would you tell me the factor of the difference in this speed?

May I have any advice?

Best Regards,
Yuuki Murasato

b36401 — Fri, 24 Jul 2015 10:10:52 GMT

Are you using the same way to measure the speed?

Please make sure that the board is running with the same clocks.

Have a great day,

Victor

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yuuki — Tue, 28 Jul 2015 07:49:17 GMT

Dear Victor-san,

I am sorry to delay.

Thank you for your support.

We measured by the same method.
The clock setting for eMMC/SD is the same, too.
The write speed is almost similar.

However, we seem that a performance of the reading speed may be inferior in Android4.4.3.

Are there any patches for eMMC/SD I/F in Android4.4.3?

Best Regards,
Yuuki