On Thu, 2002-07-18 at 18:20, Benjamin Herrenschmidt wrote: > >AGP has become very stable here since the radeon driver doesn't update > >the ring write pointer in ADVANCE_RING() but in the new COMMIT_RING(). > >Seems updating it 'too often' is no good, for whatever 'too often' may > >mean. > > I hate that. It should be fully stable or I would consider it > unuseable :(
Define 'fully stable' - no crash to infinity and beyond? ;) I can run for days without crashes on this TiBook, I consider that quite good. > On my side, I've temporarily given up trying to understand what was > going on. Does anybody have useful contacts at ATI that could help ? > > I have 2 possible ideas: > > - Some athlon-like cache aliasing issues, though I don't think PPCs > do that aggressive prefetch accross page boundaries And in that case, I'd expect the problem to be (mostly) independent from driver changes. > - Some "magic" skew value to set in the chip to compensate for some > bus arbitration issues when mixing AGP master transfers and PCI slave > transfers. Or maybe just disabling some of the AGP features like > Fast Write... Something like that seems much more likely to me, seeing as throttling the ring write pointer updates helps a great deal. -- Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer XFree86 and DRI project member / CS student, Free Software enthusiast ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
