First of all, this went to the wrong mailing list; debian-x is for discussion of the Debian X packaging. I'm CC'ing the upstream xorg list, please follow up there only.
On Wed, 2006-01-25 at 22:30 -0500, [EMAIL PROTECTED] wrote: > > On the following machine: > Athlon64 3000 > Nvidia GeForce 6600GT > Kernel 2.6.14, Xorg 6.9.0.dfsg.1-3 > (Render enabled and verified working, Composite disabled, GLX working) > > I'm getting only 22 kchar/s using: x11perf -rgb10text > Even software rendering should not be THIS slow considering that... > > ..For comparison, I dug out a retired P2-266 laptop with a PCI S3 > video chipset. It hasn't been updated for years. (Kernel 2.6.1, > XFree86 4.2.1-16) The same benchmark reported about 17 kchar/s. Things to consider: * -rgbXtext (I assume this is subpixel AA) is very non-trivial to accelerate, I'm not aware of any accelerated (and correct) implementation yet. * Hence this test probably boils down to software rendering, which is usually limited by the CPU access to video RAM. * CPU reads from video RAM are still about as slow as ever (especially with AGP, less so with PCIe). > [Sidenote: for some reason x11perf -aa10text is not working in 6.9.0.. > it still does RGB and reports the same result. Otherwise, I would > have reported this as well. Nevertheless, my guess is that the > result would be the same, judging by perceptible text redraw speed in > applications with AA vs RGB mode.] > > Also, for reference, my prior Radeon 8500 card gave similar poor > results. Before Xorg 6.9.0, I got around 45-50 kchar/s in either AA > or RGB mode using x11perf -aa10text or -rgb10text respectively. > While this sounds much faster, it is nowhere near what it should be > and still results in visibly sluggish text redraw. I used to get > around 250-300 kchar/s with AA text in some older XFree86 releases > (and one CVS checkout of pre-6.8.2 Xorg!) with varied Radeon > hardware. (RGB was still slow, around 50 kchar/s) Some of these oddities might be explained by the fontconfig configuration on your system. E.g., if your fontconfig configuration enables subpixel AA, that seems to apply to the -aaXtext tests as well. Some of us used to get fooled in the other direction because fontconfig silently chose a non-AA font for -aaXtext, so we got impossibly high numbers for that. -- Earthling Michel Dänzer | Debian (powerpc), X and DRI developer Libre software enthusiast | http://svcs.affero.net/rm.php?r=daenzer