[Mesa-dev] R600 tiling halves the frame rate

[Jerome Glisse]

On Fri, Oct 26, 2012 at 10:26 PM, Tzvetan Mikov <tmikov at jupiter.com> wrote:
>> -----Original Message-----
>> From: Jerome Glisse
>
>> > Can anyone shed some light on this? Is this by design - e.g. is
>> > this a case of "we know that tiling is currently slower than linear
>> > but the huge payoff is scheduled to arrive in a future revision"?
>> >
>> > Thanks!
>> > Tzvetan
>>
>> No, in all benchmark i made on various gpu from hd2xxx to hd6xxx
>> tiling always gave a performance boost btw 5% up to 20%.
>
> This is interesting. All I am doing is rotating a big texture on the
> screen. I am using EGL+Gallium, so it is as simple as it gets.
>
> The hack I am using to disable texture tiling is also extremely simple
> (see below). It speeds up the FPS measurably, up to the extreme
> case of doubling it on HD6460.
>
> What am I missing?
>
> Regards,
> Tzvetan
>

Could you provide a simple gl demo or point to one that shows the same
behavior with your patch. So i have something to know if i am
reproducing or not

Cheers,
Jerome