Re: Snappy GUI response

Alan Cox <[email protected]>
Newsgroups gmane.comp.xfree86.forum
Message-ID <[email protected]> 
> How could images best be compressed while being swapped out of video
> card memory? I'd guess the AGP DMA wouldn't have any provision for
> (un)compressing data, and that this would have to be done by the vm
> subsystem itself?

I would assume the DMA engine on the video chip does it. RLE is very easy
to do in a DMA engine. There are even UMA hardware subsystems that RLE
compress the live framebuffer to cut down on the total bandwidth used
when displaying the video (notably Nat Semi Geode)
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