Re: Preparation for creating netbsd-7 branch

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Jul 21, 2014 at 09:50:41PM +0200, Manuel Bouyer wrote:
> [...]
> 
> I tested earmhf vs earmv7hf on the beaglebone black. with glxgears,
> the performance improvement is less than 1%.
> 
> Do you have other tests that show a large gain with earmv7hf vs earmhf ?
> For 1% I don't think we should bother providing all of
> earmhf, earmv6hf and earmv7hf.

I rebuilt a distribution; this time with
build.sh -m evbarm -a earmv7hf -V "CPUFLAGS=-mcpu=cortex-a8 -mtune=cortex-a8 
-mfpu=neon -funsafe-math-optimizations"

Now glxgears shows a real improvement over earmhf;
from about 24.8FPS to 25.8FPS (this would be about 4%).

But we probably don't want to provide evbarm binaries with such CPU-specific
compilation options (-funsafe-math-optimizations may also be a problem for
some use case).

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--