Re: [Mesa3d-users] [Mesa3d-dev] R300 possible VBO regression

[Jerome G. <gl...@fr...>]

On Thu, 2009-08-20 at 19:13 +0300, Pauli Nieminen wrote:
> I don't understand how this particular commit is causing performance
> regression.
> 
> There is now optimisation for dma buffer objects in kms case where
> reusing old buffer object would cause wait if gpu haven't yet handled
> the rendering operation associated buffer.
> 
> This change requires kernel changes in KMS case because there was a
> bug in the latest drm pull for linus. 
> I attached a diff which fixes the problem in kernel untill Dave sends
> next pull request for Linus.

Nevertheless we should not unmap buffer if we are going to remap it,
map/unmap is way too costly with KMS. Pauli any good reason to unmap ?

Cheers,
Jerome