Date   : Thu, 09 Mar 2006 11:18:00 -0000
From   : "David Hunt" <dm.hunt@...>
Subject: Re: Warning: Sad case on list!

> > The depth of that FIFO won't matter too much, probably.
> > The ARM side will be waiting for 'slomo' to draw things
> > most of the time anyway. Saving a few cycles just on
> > getting the VDU bytes through won't make that much of
> > a difference.
> 

Yes, but if you've got the spare space, what not ?

> If you time how long it takes /just/ to draw things and how long it
> takes /just/ to calculate things then - given a big enough FIFO the
> smaller of those two times is the fastest you can get. If it's
> currently slower than that then a sufficiently large FIFO will speed
> it up :)

I changed the program so only lines are drawn rather than points, it didn't
improve the performance of the program, but the SPOOL files went from
980kbytes down to 52kbytes. Now I build the display via lines, basically a
progressive scan. The large blocks was a nice idea, it's just hugely
processor intensive.

Dave ;)