michel at tungstengraphics.com
Wed Aug 8 06:26:52 PDT 2007
On Wed, 2007-08-08 at 14:36 +0200, Lukas Hejtmanek wrote:
> On Wed, Aug 08, 2007 at 11:19:19AM +0200, Michel Dänzer wrote:
> > > Btw, is it possible to expose offscreen pixmap to the application so that
> > > PutImage and GetImage can be safely ignored?
> > Not sure that's what you mean, but you can try commenting out the
> > exaDoMigration call in exaGetImage to see if that makes any difference.
> Forget that question, [...]
Have you still tried my suggestion though? It's perfectly possible that
migrating the pixmap to system memory in exaGetImage is generally a bad
> But the point here is that EXA seems to spend huge amount of time to Put and
> Get images. XAA does only PutImage and it seems to be faster. I understand
> that with EXA, it is cost of acceleration because we need to keep pixmap in
> offscreen area to do acceleration and then to migrate to the system memory to
> use CPU for some raster operations. Am I right? While in the case of XAA, the
> most operations is done by CPU and the result is only transfered to offscreen
> > As has been pointed out, it could be done using the IRQ. This will
> > probably happen via fences when using TTM, in the meantime you could try
> > using DRM_IOCTL_I915_IRQ_EMIT and DRM_IOCTL_I915_IRQ_WAIT.
> Using this approach, IRQ should be generated after the accelerator has
> finished a request?
For starters, just emit an interrupt in I830Sync() and wait for it.
Earthling Michel Dänzer | http://tungstengraphics.com
Libre software enthusiast | Debian, X and DRI developer
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