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Hi, until now we have been ignoring the fact that the video update rate using the frame buffer wiki and a neek is slow. Has anyone looked into this enough to figure out where the bottleneck is? Has someone found a solution? Or am I doing something wrong? THanks in advance -Alex
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Hi Alex,
you should do some quick math to check whether your RAM memory interface is the bottleneck. Remember that the framebuffer area is in the same physical memory as your data and instructions (of course caches could change things somewhat).
In one system I've seen, the VGA controller was using the memory 90% of the time, and all other peripherals had to dispute with each other to get a share.
If your RAM is 16 bits wide, things could be even worse, because it would take two memory accesses to fetch a 32-bit word.
Cheers,
Ricardo.
Honored Contributor
