Re: specific optimizations for unaccelerated framebuffers

From: Pavel Machek (
Date: Fri Oct 05 2001 - 19:35:47 EST


> I am not speaking of DMA'ing at the refresh frequency (approx 70 times
> per second the complete video memory), just the modified 64Kb blocks,
> "once upon a while": if a single pixel is written twice, you will just
> see the latter written value on the screen - but who cares.
> Been able to DMA the complete video memory image around 5-10 times/second
> should be over the human eye sensitivity.
> Moreover this pixel will stay on the processor memory cache a lot
> longer, even without MTRR processors.

Yep, that should work. Same trick as xterm uses.
[Of course, user *will* see you are only updating at 5fps... But it will
be way beter than current slowness.] Are you going to create a patch?

Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at

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