Keith Packard wrote: > On Mon, 2008-05-19 at 05:09 -0700, Keith Whitwell wrote: > > >> I >> think the latter is the significant result -- none of these experiments >> in memory management significantly change the command stream the >> hardware has to operate on, so what we're varying essentially is the >> CPU behaviour to acheive that command stream. And it is in CPU usage >> where GEM (and Keith/Eric's now-abandoned TTM driver) do significantly >> dissapoint. >> > > Your GEM results do not match mine; perhaps we're running different > kernels? Anything older than 2.6.24 won't be using clflush and will > instead use wbinvd, a significant performance impact. Profiling would > show whether this is the case. > > I did some fairly simple measurements using openarena and enemy > territory. Kernel version 2.6.25, CPU 1.3GHz Pentium M, 915GMS with the > slowest possible memory. I'm afraid I don't have a working TTM > environment at present; I will try to get that working so I can do more > complete comparisons. > > fps real user kernel > glxgears classic: 665 > glxgears GEM: 889 > openareana classic: 17.1 59.19 37.13 1.80 > openarena GEM: 24.6 44.06 25.52 5.29 > enemy territory classic: 9.0 382.13 226.38 11.51 > enemy territory GEM: 15.7 212.80 121.72 40.50 > > Keith,
The GEM timings were done with 2.6.25, except on the i915 system texdown timings which used 2.6.24. Indeed, Michel reported much worse GEM figures with 2.6.23. Your figures look a bit odd. Is glxgears classic CPU-bound? If not, why does it give a significantly slower framerate than glxgears GEM? The other apps are obviously GPU bound judging from the timings. They shouldn't really differ in frame-rate? /Thomas ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
