Subject: Re: More on rcons performance woes: pmax profiling
To: R. C. Dowdeswell <>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
List: tech-kern
Date: 03/02/1999 02:41:51
>I rewrote the rcons stuff on the alpha/TGA for my Multia (code
>being reviewed by Ross), and got a 16x improvement in speed by
>simply replacing copyrow() routine with something that uses the
>TGA's blitting.

I'm still using rcons -- we wont get pmax input-side done for 1.4--
but yes, thats a win, if the hw has it.

>I've also been thinking about replacing the char painting code with
>stipple blitting as that would allow the chars to be drawn a lot
>faster, but to actually get much advantage out of that wscons would
>have to pass me multiple characters at a time (which I was also
>thinking of looking into at some point).
>But all in all, I think that the biggest win for all platforms
>would be jump scrolling as it reduces the number of times that rows
>need to be copied.  (Thus a bit less MI acceleration would be

Isnt rcons doing jump-scroll already? it sure looks like it is, when I
do a cat to /dev/rcons whilst running X on the same display.
Or do you mean trying to  jump-scroll multiple lines?