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LCA: Catching up with X.orgLCA: Catching up with X.orgPosted Jan 24, 2009 0:37 UTC (Sat) by nix (subscriber, #2304)In reply to: LCA: Catching up with X.org by jwb Parent article: LCA: Catching up with X.org
Text scrolling performance in X.org 1.5 is intolerably awful, I know that
(we're talking five seconds of 100% CPU consumption by X on an Athlon IV to repaint the screen just once).
As soon as I figure out how to get sysprof to report backtraces inside X
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LCA: Catching up with X.org Posted Jan 25, 2009 23:32 UTC (Sun) by jlokier (guest, #52227) [Link]
Sounds like a configuration error - using software scrolling (no acceleration) and not using a shadow framebuffer. That results in a lot of reads from video memory to the CPU (not GPU), which is often that sort of very slow.
Try enabling some kind of acceleration at least :-)
This isn't new to Xorg 1.5, but maybe it configures itself differently and gets this wrong.
LCA: Catching up with X.org Posted Jan 29, 2009 11:52 UTC (Thu) by nix (subscriber, #2304) [Link]
It's slow both with XAA and EXA, both of which should surely be accelerating. xterms forced to use core fonts scroll *fast*. Everything else is as fast as usual as well.
I wonder if render acceleration has been broken in recent versions of the ATI driver and/or x11-xserver 1.5... it's something that was only ever implemented for r200 cards anyway, so it could have been broken without most people noticing.
LCA: Catching up with X.org Posted Feb 5, 2009 0:30 UTC (Thu) by nix (subscriber, #2304) [Link]
Fixed! The X-server-to-be, 1.6, is blindingly fast at client-side font
scrolling: client-side fonts, even antialiased ones, are very nearly as fast as core fonts in 1.5. The glyph cache in 1.6 is excellent.
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