On Fri, 12 Jul 2013, Christian König wrote:
Hi Ilija,well that's very interesting and no it's quite unlikely that this is cause by the DMA ring because the radeon_sa_bo structure should be allocated on system memory and the GPU can usually only access it if you map it through GART.
OK that's good information to know. I'll do some more investigation on my end.
Is that easily reproducible for you? Is there already an open bugreport?
It typically happens out of the blue after several days of running, but it happens consistently (just like padding the radeon_sa_bo structure consistently suppresses the problem).
However, like I said, my kernel is full of my own patches that don't live in the upstream tree, so I am not excluding the possibility that one of my hacks introduced the problem (though, I find it unlikely).
I have not yet opened the bug report, because I first want to reproduce the problem with the upstream kernel that is free of my hacks. As soon as
I do that, I'll write the ticket. -- Ilija
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