iMX6 - CPU usage not able to achieve 100%

iMX6 - CPU usage not able to achieve 100%

[ansaris]

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Hi,


We are using imx6Q custom platform based on sabresd platform for our 
development with Linux 3.10.17_1.0.0-GA BSP.

We have checked the CPU usage using "top" command.

A simple test program running on a PC shows 100% whereas the same program running on this module (compiled with different compiler, of course) shows again 25%. Now, 25% is not hard limit, I have, albeit rarely, seen it to get to 33%, as well.

Why a single core does not usually go more than 25%?

Please suggest us.  Thanks in advance.

Thank You,
Regards,
Ansari


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Re: iMX6 - CPU usage not able to achieve 100%

[Jean-Michel Hautbois]

Hi,

2015-01-30 14:58 GMT+01:00 ansaris <ansaris@iwavesystems.com>:
>  Hi,
>
>
> We are using imx6Q custom platform based on sabresd platform for our
> development with Linux 3.10.17_1.0.0-GA BSP.
>
> We have checked the CPU usage using "top" command.
>
> A simple test program running on a PC shows 100% whereas the same program
> running on this module (compiled with different compiler, of course) shows
> again 25%. Now, 25% is not hard limit, I have, albeit rarely, seen it to get
> to 33%, as well.
>
> Why a single core does not usually go more than 25%?
>
> Please suggest us.  Thanks in advance.
>
> Thank You,
> Regards,
> Ansari

Maybe can it help (you noticed of course that you have a quad core,
and 25% is 100%/4) :
http://unix.stackexchange.com/questions/41311/cpu-and-core-usage-stats

JM