I did not check if the binary code is similar, but I did measure just the for-loop in both worlds and the times are those I described previously.

On the other hand, this code, which I used as test code before (previous messages in this post) does have a similar execution time in both worlds:

void bench(int n) {

int buf[1024];

int i, j, k, r = 0;

for (i = 0; i < 1024; i++) {

buf[i] = 0;

}

for (j = 0; j < n; j++)

for (i = 0; i < 1024; i++)

for (k = 0; k < 1024; k++)

buf[i] = buf[i]+j+k;

for (i = 0; i < 1024; i++) {

r += buf[i];

}

PINF("Ended Bench %d - %d", (int)buf[0], r);

}

I tested this with n = 100000 and it showed an execution time of about 500 ms in both worlds.

2016-06-23 15:23 GMT+01:00 Christian Helmuth <christian.helmuth@...1...>:

Hello Tiago,

On Thu, Jun 23, 2016 at 02:40:10PM +0100, Tiago Brito wrote:
> // start timer here
> for(i = 0; i < size; i++) {
> color = oldp[i];
> alpha = (color >> 24) & 0xff;
> red = (color >> 16) & 0xff;
> green = (color >> 8) & 0xff;
> blue = color & 0xff;
> lum = (int) (red * 0.299 + green * 0.587 + blue * 0.114);
> newp[i] = (alpha << 24) | (lum << 16) | (lum << 8) | lum;
> }
> // end timer here
> // check timer diff and print result
>
> I'm testing this same exact code on both the Secure and Nonsecure domains.
> In the NW I'm getting about 155 ms of execution time, which for that buffer
> and transformation seems ok. On the other hand, the SW is giving me about
> 610 ms of execution time.
>
> I can't seem to find a reasonable explanation for this time difference,
> since the code running in both scenarios is exactly the same. The secure
> code is running inside the TZ_VMM example.

Did you check that the generated binary code is similar? Did you try
to measure only the run time of the for-loop in both worlds?

Regards
--
Christian Helmuth
Genode Labs

http://www.genode-labs.com/ · http://genode.org/
https://twitter.com/GenodeLabs · /ˈdʒiː.nəʊd/

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

------------------------------------------------------------------------------
Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
Francisco, CA to explore cutting-edge tech and listen to tech luminaries
present their vision of the future. This family event has something for
everyone, including kids. Get more information and register today.
http://sdm.link/attshape
_______________________________________________
genode-main mailing list
genode-main@...12...ceforge.net
https://lists.sourceforge.net/lists/listinfo/genode-main