Here my results:
1. I changed my programm loop to the following integer calculations:
int i;
int a = 0;
int b = 23210
for(i = 0; i<35000; i++)
{
a = a + b;
}
With that i got a frequency of 413 Hz with Starterware and 420 Hz with
Linux. So finally a comparable result. The following is quite interesting:
changing the number of loops from 35000 to 10000, 1000, 100 and 10; I found
out that Starterware gets faster and faster while Linux stucks at 6 kHz due
to the sysfs interface of the GPIOs.
2. Using this Link
http://processors.wiki.ti.com/index.php/StarterWare_NeonVFP I coud enable
the FPUs of the Cortex-A8 on Starterware. My loop with the sqrt-Function
from above speed up from 500ms to 11,2ms on Starterware but still this is
10 times slower than on Linux where I measure 1,1 ms !!!
3. I changed my FPU testing loop to the following:
int i;
float x = 0;
float y = 2.812;
for(i = 0; i<35000; i++)
{
x = x + y;
}
Running the Starterware program on debug mode, I measured 870 Hz and in
Linux 900 Hz. Running Starterware on release mode, I even measured 1,1 kHz.
So doing float calculations without math-Functions, I finally get a
comparable result. But still there is this questions with what the Compiler
does with the sqrt-Function???
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
