[Bug 27618] Very slow wine Opengl performance with ASUS 1215N

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=27618

Roderick Colenbrander <thunderbird2k at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |thunderbird2k at gmail.com
         Resolution|                            |INVALID

--- Comment #1 from Roderick Colenbrander <thunderbird2k at gmail.com> 2011-06-27 13:23:59 CDT ---
The issue you are seeing is not a Wine problem. Bumblebee uses VirtualGL and
the use of VirtualGL comes at an additional performance hit.

The way things work when you use VirtualGL is that all 3D content is rendered
on the Nvidia GPU. In order to show the images on your screen, every 3D frame
has to copied back to system memory and copied back to video memory on your
Intel card.
This is quite slow and stress the PCI-E bus quite a bit (especially on laptops
where you typically have much less bandwidth). It directly slows down the game
as well because this is all happening during the 'glXSwapBuffers' call the game
makes.

On Windows the Nvidia drivers use similar VirtualGL-like tricks to render on
the Intel GPU, but there are a lot more optimizations are in place (and there
is likely more direct interaction with the Intel driver).

At least this issue is definitely not a Wine bug.

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