SPU overlay example?

[Ulrich Weigand]

Marcus Daniels wrote:

> However, I was trying to run the executable directly (with the help of 
> the binfmt_misc kernel module) and that apparently is different from 
> issuing my own SPE calls in a my own PPE loader program.  I noticed that 
> the _EAR_ wasn't initialized, and guessed that it wasn't setting up the 
> PPE memory in the needed way.

It should work for a stand-alone SPE executable as well; elfspe (libspe)
should fill in the _EAR_ value at load time.  Maybe the libspe version
you were using didn't support that correctly?  (Although the code should
be in since SDK 2.0 ...)

> It runs now with that overlay scheme, 
> and I'm surprised by how fast the overlays are.   Around a factor of 4 
> worst case vs. no overlays.

That's good to hear!

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU Toolchain for Linux on System z and Cell BE
  Ulrich.Weigand@de.ibm.com