[Bug 104082] amdgpu 0000:07:00.0: swiotlb buffer is full (sz: 2097152 bytes)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104082

--- Comment #23 from Christian König <ckoenig.leichtzumerken at gmail.com> ---
(In reply to Andreas Kilgus from comment #22)
> I am getting these messsages on my machine right now, too.
> 
>              total       used       free     shared    buffers     cached
> Mem:      16386788   15157252    1229536     761064      88852    2660664
> -/+ buffers/cache:   12407736    3979052
> Swap:     25165820        156   25165664
> 
> There is enough RAM left to allocate a 2 MiB block.

No there isn't. 1229536 pages free means that there are 1229536 4k pages
available that doesn't tell us anything about 2MB pages, nor if those are
usable for swiotlb.

Take a look at /proc/pagetypeinfo. There must at least be pages at order 9 or
higher for an 2MB swiotlb allocation to succeed.

An alternative workaround is David Zhou's patch which completely avoids the
swiotlb allocator on x86.

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