Initial attempts at i965 text batching

[Kristian Høgsberg]

On Dec 19, 2007 11:12 AM, Carl Worth <cworth at cworth.org> wrote:
> So a long time ago I reported that with my i965 I could get about
> 290,000 glyphs/sec. from "x11perf -aa10text" by using the NoAccel
> option to the X server, and similar performance with XAA, but only
> 95,000 glyphs./sec with EXA due to the synchronous compositing bug in
> the driver.
>
> Since then, Dave Airlie rewrote the driver to use batch buffers,
> which completely eliminated all of the syncs. By design, his work was
> "functional, not performant" as it would go through all the effort of
> allocating a new batch buffer, initializing all device state, and
> emitting the batch for every compositing operation.
>
> Needless to say, that's more work than we really want to do, and it
> showed by getting performance in the range of 1000 - 10,000
> glyphs/sec.
>
> Since then, I've rewritten parts of the driver to attempt to take
> advantage of the batch buffers by actually batching up as much as
> possible. General device state is only initialized once, then
> surface-specific state is initialized in a batch basis within a buffer
> object.

Which reminds me, I did a couple of DRM patches to use MI_SET_CONTEXT
that I promised to send out.  I've not benchmarked them, and there is
still work to do to finish them (they leak memory) but if there's a
lot of overhead in emitting the invariant state, these patches might
help.

cheers,
Kristian
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