Kevin Brosius wrote:
>
>
> I suppose we could add an option, something like 'early_sync' (or maybe
> something more descriptive) which changes the accelerator sync behavior
> in 4.0.x drivers to make them behave more like 3.3.6. I'd be willing to
> make a trial s3virge driver with a change like this so you could test
> it.
I have no problem with being a crash test dummy :-) (will have to switch
to
XFree 4.0.1 again though :-) I will have to give back the G400 on
monday so
can't test that anymore,but the super s3virge card is all mine :-). I
have the
Xfree 4.0.1 sources here so iyou could just mail me a patch or even just
say
what i should change where (if it are small changes) I will try to get
my hands
on some other videocards so i can try those too.
>
> Mark,
> I'm thinking of adding AccelSync commands to all the Subsequent
> accelerated primitives and enabling them on an option. That should get
> us close to the 3.3.6 architecture in a switchable way.
>
> All,
> Although maybe we should be asking a more general question. Is 3.3.6
> (or a 3.3.6 architecture) really going to meet your latency requirements
> in all cases? If the accelerator can cause this problem in 4.0.x, it is
> entirely possible that 3.3.6 has the problem also, but because it
> doesn't pack the accel. FIFO as efficiently, it is harder to see failing
> cases.
What would be a good test programm to really push the accelerator to the
max, and
in all possible accelerations ?
Which functions in 3.3.6 can be accelerated in the first place ?
>
> >From a design standpoint, how are you going to guarantee your hard real
> time numbers? (Which leads back to my suggestion of not running X on a
Hmmm if you mean "how is RT-Linux implemented" you should just take a
look
at www.rtlinux.org and www.rtai.org where it is explained in great
detail.
> hard real time system, at least with these particular S3 & Matrox
> cards.)
Well i only was able to test those two cards, so are other cards not
having this
problem.
- Erwin
>
> Kevin
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