On 10 November 2011 17:46, Alex Deucher <alexdeuc...@gmail.com> wrote: > On Wed, Nov 9, 2011 at 12:36 PM, Iustin Pop <ius...@debian.org> wrote: >> Package: xserver-xorg-video-radeon >> >> Version: 1:6.14.3-1 >> Severity: minor >> >> Hi, >> >> The recent upgrade of xserver-xorg-video-radeon from 1:6.14.2-2 to >> 1:6.14.3-1 enabled ColorTiling for my card, which in turn caused a >> significant performance degradation in 2D (yes, I understand it should >> make 3D faster, but I didn't know it should slow down 2D applications). >> >> I'm using plain 2D environment (openbox, no compositing, anything) and >> plain xterm (bitmap fonts, no AA, etc.). The speed of display text has >> changed significantly enough that I can "see" my mutt refreshing the >> inbox and drawing the lines. >> >> Cat-ing a big (~4K lines of text) file on a full-screen xterm is: >> >> - 6.14.2-2 (low power profile): ~0.8s >> - 6.14.3 (high power) : ~3.1s >> - 6.14.3 (low power) : ~5.0s >> >> So it's more than 5x time slower, which makes it "unpleasant". >> >> Simply disabling ColorTiling makes the problem go away, and 6.14.3 is as >> fast as 6.14.2. >> > > Tiling will speed up all rendering (2D and 3D). However, it sounds > like you are using an environment that is mostly software rendering. > As such in order for the CPU to access tiled buffers, the GPU has to > copy them to a linear buffer before CPU can access it properly.
FWIW I have color tiling enabled and have no speed issues in urxvt - TrueType fonts, AA enabled, etc. Unlike xterm urxvt (rxvt-unicode) uses some special font-rendering libraries, however. If I understand it correctly xterm would use the in-server bitmap font rendering which the X server can accelerate as much as it wants. Thanks Michal -- To UNSUBSCRIBE, email to debian-x-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/caomqctt7a-m+1hy19gwwqkmqevbzt-5edgycwcao8s_+hov...@mail.gmail.com
