[maemo-developers] Maemo 5 and hw accelerated X.Org?

[From: Eero Tamminen]

Hi,

ext Kuba Irzabek wrote:
> Is xserver in Maemo 5 (Nokia N900 OMAP 3) using hardware acceleration 
> (SGX)?

Yes, to some extent, but SGX is 3D accelerator, you cannot really expect
it to make much difference for most 2D operations.

For simple 2D operations like blitting, SGX is actually slower. In those
kind of operations both CPU and SGX are memory bandwidth bound, but SGX
is run at slower speed than CPU and has command setup cost.

Memory ownership change between CPU and SGX has also a performance cost
because this requires cache flush.


I cannot find confirmation on that anywhere. I found inforamtion
> that accelerated user interface on omap 3 can be done using qt embedded 
> or clutter and not xserver. Where can I find more on that topic?


	- Eero