ARM cache usage

[William Busacker]

Hi All,

Can someone point me in the direction of material that can explain how 
RTEMS uses the MMU on an ARM processor (specifically the ARM11 that the 
Raspberry Pi uses)? I want to see if there are any optimizations I make 
in code to take better advantage of how the memory access system works.

My reasoning for trying this is I have a bit of software that is taking 
several 12x12 matrices and vectors of similar size and 
multiplying/adding/inverting them all together a few hundred times over. 
These are all float type, and while I know the sheer calculation time is 
quite high the measured execution time is much higher than it should be 
leading to me suspect that there is memory bottle neck. What I would 
like to know is how the caching system works so I can maybe make 
adjustments to take better advantage of the cache and possibly reduce 
execution time.

This code is also being generated using Matlab's C Autocoder so that 
code itself isn't exactly readable (but being that I'm using a 
University Matlab license for free, I can't complain too much) so I'd 
like to try and keep manual adjustments to a minimum. If anyone knows of 
tricks to get autocoder to play nicer, that would be great too.

Thanks!
Will Busacker