Re: Benchmarking RM9000

[Ralf Baechle <ralf@linux-mips.org>]

On Fri, Jul 08, 2005 at 03:42:29PM +0100, Alex Gonzalez wrote:

> The performance of our video application is well below our expectations.
> We are still doing some profiling work on it, but we are also looking at
> other possibilities.
> 
> What other benchmarking tool would you recommend?
> 
> Currently it's a NFS mounted system, but even if we could use a block
> device the access speed wouldn't be more than 1.5 Mbps, so that is a
> limitation for the benchmark.

As a shot into the dark ...

Make sure you exploit the RM9000's write-gathering capabilities when
writing into the frame buffer.  If the frame buffer happens to be on
a PCI device you're probably performing uncached writes which will
slow down the thing to a crawl.

  Ralf