On Fri, Apr 15, 2011 at 11:46 AM, Joerg Roedel <joro@xxxxxxxxxx> wrote: > On Fri, Apr 15, 2011 at 03:16:50PM +0200, Ingo Molnar wrote: >> Ok, but how did the allocation changes start triggering this error in >> v2.6.39-rc1? There must still be some layout specific thing here, right? >> Do we understand the details of that as well? > > Well, thinking again about this, the GPU likely generated this DMA > request before too (which has an address in the range configured for the > GTT on the card), but nobody noticed because they just hit main memory. > And with the allocation changes in 39-rc1 the GART aperture started to > be on the same address as the GTT (in their respective address spaces) > so that the DMA request hit the GART. This caused the MCE and the > sync-flood. > The open question is why the GPU generates a DMA request with an address > that is configured as the GTT base (+1 page) on the card. > > Joerg > Do you also got the write if you load radeon with radeon.no_wb=1 ? I think at this address it's the wb page, or maybe the cp as wb likely take only one page Cheers, Jerome _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
