Daniel Vetter writes: > Just a quick comment on this: Since most framebuffers are write-combining, > and reads from that tend to be ~3 orders of magnitude slower than writes > (at least on the pile of machines I looked at here, there's big > differences, and some special streaming cpu instructions to make the > reading side not so slow). > > So scrolling by copying tends to be significantly slower than just > redrawing everything. I know this was the case years ago with AGP as iirc, it doubled ( 4x, 8x ) the PCI clock rate but only for writes wasn't it? I thought this was no longer an issue with PCIe, but if it is, then I guess I'll go ahead with cleaning up the dead code and having it re-render with the larger text buffer.
