[OT: newbie questions] Re: EXA patches

[Joel Feiner]

On Tue, Aug 4, 2009 at 9:54 AM, Dave Airlie <airlied at redhat.com> wrote:

> On Tue, 2009-08-04 at 09:49 +0800, Joel Feiner wrote:
> > 2009/8/4 Michel Dänzer <michel at daenzer.net>
> >         <snip>
> >
> >         I wonder if maybe the slowdown I'm seeing is because the
> >         radeon driver
> >         is temporarily lacking UploadToScreen and DownloadFromScreen
> >         hooks with
> >         KMS, though I'm not sure what those would be used for with
> >         text
> >         rendering.
> >
> > Off-topic, but if I may enquire out of intellectual curiosity: why
> > doesn't the KMS version of Radeon have UTS and DFS acceleration?
>
> The code is in the branch, but its really ugly, I was hoping to actual
> do it cleaner which might involve a new kernel interface to ask for the
> current placement of a buffer object so we can decide whether to just
> memcpy or we need to blit for DFS. I'm not sure I saw a good reason for
> UTS, doing Host data blits isn't really useful with BOs at least with
> the current code.
>
> Dave.
>
> Which branch?  And does it work?  I'm wondering if it might be worth trying
if only to see if it solves my KMS slowness bug (
https://bugs.freedesktop.org/show_bug.cgi?id=23085) -- that's the selfish
reason for my question ;).

And I'm sorry for my lack of knowledge on the subject, but why would UTS be
unnecessary?  Is all 2d rendering done in such a way that it can be done in
video memory?  Or perhaps I am misunderstanding what UTS and DFS actually
do.
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