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SubjectRe: fbcon + scrolling = irq timeouts?


James Simmons wrote:

>
> I agree something needs to be fixed. The the bigger the framebuffer gets
> the longer its going to take to do things like clear the framebuffer
> kernel side. I have been working on a new fbcon API that will use accel
> wrapper to eliminated the latency problems. As for cards that do have
> accels I have been working on software emulated accels used for teh
> consoel wrapper. What I'm trying to do is to get it to do 64 bit
> transfers. Hopefully this will cure the latency problem.
>
>

as long that there are no real BIOS problems (mentioned by Alan Cox),
I think the best is to break up long operations in smaller ones.
( check rescheduling after n MByte of data has been copied or so ..)

James, can you please explain what exactly the "accel wrapper" is.
sorry for my ignorance :-)

I think 64bit transfers will not elimitate latencies, it will only lower the
latencies
by factor 2 (ideal case), but that might not be enough for the hardcore latency
folks, especially the realtime audio folks.

Benno.



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