On Fri, 31 Oct 2003, Pieter Hulshoff wrote: > On my SuSE 8.2 system, default xfree86 drivers, which are? > I get very slow performance > using Fullscreen DGA (using xmame) on my Hercules AIW 9000 card. I've used a Screen updating using DGA is not accellerated. It is just like writing to (slow!) memory. > morphix boot cd as well, which use which XFree86 version? > and the performance is fine there. Windowed > performance (same xmame, same game, same options) is fine as well. Updating Windows is usually accellerated. (Unaccellerated) Write performance to the screen is extremely dependent on telling your CPU that this memory area is to be treated specially: don't blow the CPU cache on trying to accellerate it but combine as many writes into one as possible (to enable burst writing and to not perform useless reads from the screen buffer). This is controlled by the MTRR (Memory Type Range Registers). You can view them and write them as /proc/mtrr under Linux. To see where the screen buffer is located, poke around with lspci -vvv or /proc/pci (or somesuch). -Peter PS: X should enable the right range automatically but sometimes it doesn't work. It probably even tells you that it tries to fiddle with the MTRRs and fails. Take a look at the logfiles. _______________________________________________ XFree86 mailing list XFree86@xxxxxxxxxxx http://XFree86.Org/mailman/listinfo/xfree86
