(In reply to Andreas Kilgus from comment #24)
> (In reply to Christian König from comment #23)
> > Take a look at /proc/pagetypeinfo. There must at least be pages at order 9
> > or higher for an 2MB swiotlb allocation to succeed.
> 
> OK, I had a look and if I got it right: memory fragmentation lets the malloc
> fail. <nitpick>I still would not call that to "run out of memory" - there is
> enough memory available, its current layout is just not in the desired
> shape.</nitpick> ;)

Yeah, correct.

One interesting point is that this only seems to happen when DC is enabled, so
that points to a possible memory leak there.

Would be interesting to monitor amdgpu_gem_info if there are an increasing
number of buffers around when DC is enabled.