Hi there,
I am testing the performance of the beaglebone in combination with the
no-OS Starterware from TexasInstruments and with the Linux Distribution
Angström.
My test program, which I wrote for both for Starterware and Linux, does the
following: I configure GPIO_1_28 as an output pin and in an endless loop I
do...
1. set the pin HIGH
2. for(i=0; i<35000; i++)
{ x = sqrt(3.141592654); }
3. set the pin LOW
4. for(i=0; i<35000; i++)
{ x = sqrt(3.141592654); }
Then I used an oscilloscope top measure the period time / frequency of the
output. My first results:
using Linux, the period is T = 1,1 ms (with a Jitter of about
70 us)
using Starterware, the period is T = 18 s !!!!
Wondering why Starterware is so amazing slow, I started googling and found
the following post in a TI forum:
http://e2e.ti.com/support/embedded/starterware/f/790/t/208033.aspx
The guys on that forum manged to speed up Starterware by enabling Cache and
MMU like in the example \\StarterWare\examples\evmskAM335x\uart\uartEcho.c
So I also integrated the functions MMUConfigEnable() and
CacheEnable(CACHE_ALL) into my program. It kind of worked, my new results
for Starterware:
T = 500 ms
But still !!! 500 times slower than on Linux.
Did anyone make similar experiences or do you have a clue what could be
wrong with Starterware? In the past i only did programming on simple
Microcontrollers, so I don't really know how to handle all this cache and
MMU stuff.
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