> > > > Very few machines that the OGC would go into have PCI-X. So you only > > > > get "plain" PCI. And you have to share that 133 MBps with the other > > > > PCI devices. And lots of machines have other important > > > > high-bandwidth devices on the PCI bus. > > > > > > > > That's fine for mostly static things like most desktop apps. Email, > > > > spreadsheet, image viewer, most web browser use, ... > > > > > > > > But many (most?) users are going to want to be able to watch video. > > > > OGC is supposed to support 2 dual-link displays. Last I read, > > > > OGC is not going to have an mpeg decoder, and even the hw scaler has > > > > been dropped. Even if the CPU is fast enough (most will not be), and > > > > even if you give 100% of the PCI bus to the OGC (not realistic), and > > > > only driving 1 display, the bits just don't fit. > > > > > > We can use the drawing engine to do hardware scaling, and there will > > > be=3D20 colourspace conversion. That is, we'll have hardware support fo= > r=3D20 > > > XVideo. Most of the consumer cards in use today don't offer more than= > =3D20 > > > that, and it works just fine here watching DVDs (Athlon XP 1700+,=3D20 > > > Radeon VE QY 32MB AGP). > > > > DVD is just SD. Try 1920x1080. Can the 1700+ and Radeon do that? > > What is the CPU percent idle? > > My system can't handle HD MPEG4 decoding and playback. This a Radeon 9800X= > T=20 > on AGP8x, with a Athlon 64 3200+ and a gig of RAM. However, DVDs work just= > =20 > fine. I hypothesise that *any* HD playback requires either PCIe or PCI-X o= > r=20 > on-graphics-card decoding and scaling to work.
Actual data! Thank you! Now, my notes say that AGP 8x is supposed to do 2133 MB/s. 1080p @ 24 bpp would need 373,248,000 bytes/sec. 1080p @ 32 bpp would need 497,664,000 bytes/sec. Even a 30" display at 2560 x 1600 x32bpp @ 60Hz is "only" 983,040,000 B/s. So AGP 8x should not be your problem. I suspect that if you run "systat vmstat" or "top", it will say the CPU is 100% busy. And while a AMD64 3200+ is not the very fastest CPU available, it is close. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
