[Dri-devel] Performance Measurements

[Daryll S. <da...@va...>]

We've started using a package called soprof to collect some profiling
information on our drivers. We're going to get soprof posted soon, so
that everyone can take a look at it.

This profiling showed off a couple places where the DRI was being
inefficient in the tdfx driver. The first was that the lock function was
inlining too much code. The second was that the locking was happening at
too fine a level when it processed vertex buffers. Moving the locking up
also improved performance. The net result was about a 10% improvement on
my hardware. Those changes are checked into my new tdfx-2-1-branch. This
will be the current development branch for tdfx work now that the
drivers are rolled together.

There's lots more performance work that can be done. From looking at the
performance numbers I think we've nailed all the easy ones. The next
step would be to improve the tdfx driver to be more efficient. I'm
attaching the profiling information to this message so you can see it.

There's a few things to notice. Several of the fifo management routines
take a substantial amount of time, but we find that the card is idle
during those times. The card should be busy during all these
functions. I've also rolled a few triangle routines together into one in
this table.

We're just getting this out on the table for people who want to start
looking at optimizing some of this code.

						    - |Daryll

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