[Open-graphics] Video interrupt enable/disable

[Timothy Normand Miller]

On 5/6/07, Jean-Baptiste Note <jbnote at gmail.com> wrote:

> So my question to you is: what is the current maximum latency allowed
> by the current OGP design ? And is it critical in a typical x86 system

Like I say, I've been working with graphics cards and drivers since
1996.  We never had a problem then, and we're especially not going to
have a problem now, with 11 years of advancement.

I think other aspects of the system behavior will have a greater
impact on OGA than will interrupt latency.  Multitasking, for
instance.  Keep in mind that user processes will be deciding what the
graphics card does, and they don't get exclusive access to the CPU.
The only performance-critical interrupt-related things will involve
drawing, and we'll time our interrupts so as to be sure that the GPU
is still busy working on old stuff long after we interrupt the host
and ask for more.

-- 
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project