Tiling on i915-class hardware

[Alex Bennee]

2009/3/5 Vasily Khoruzhick <anarsoul at gmail.com>:
> Hi, I've just tested i915 tiling in 2 ram configurations:
>
> 512mb, single channel: tiling works perfectly, no performance issues with
> tiling enabled
> 512mb + 512mb dual channel interleaved: When tiling is enabled it introduces
> performance regression, when I enable tiling 3D performance is low. With
> tiling disabled I hit this bug:
> http://bugs.freedesktop.org/show_bug.cgi?id=19738
>
> So, the problem exists at least for configurations with 2 memory modules in
> dual channel interleaved mode, and it doesn't exist in single channel mode.
>
> I can provide any additional info if you need.

Interesting. I wonder if my regression is related? My setup is 4gb of
main RAM of which some is nicked for the graphics by the on board
intel chip. I assume its provided by multiple DIMMs, I never actually
looked in the box. Unfortunately I'm away from my box for the next few weeks
so I can't try fiddling with the BIOS allocation and seeing what
happens.

Hopefully you guys will have it all figured out by the time I get back ;-)

-- 
Alex, homepage: http://www.bennee.com/~alex/
CV: http://www.bennee.com/~alex/cv.php