Re: AMD Quad core - PCI-DMA: Out of IOMMU space on > 4 GB RAM

[Luis R. Rodriguez]

On Mon, Mar 16, 2009 at 12:15 PM, Luis R. Rodriguez <mcgrof@xxxxxxxxx> wrote:
> I've run into "PCI-DMA: Out of IOMMU space" messages after loading and
> unloading a module 30 times. The interesting thing is this only
> happens if I have > 4 GB of memory. The box this occurs has AMD Phenom
> quad core CPU so I take it a harware IOMMU is being used. Below are
> example relevant messages with > 4 GB and then < 4 GB of memory. The
> driver I tested this with was ath9k. It could be an issue perhaps with
> ath9k but I am unable to find an issue in our probe/removal.
>
> Could this be an issue with the AMD IOMMU used? Or is it more likely a
> driver issue?

I forgot to mention I'm using l Linus 2.6.29-rc8 with some
serialization patches applied for ath9k (which are unrelated to
DMA/IOMMU/probe) [1].

http://www.kernel.org/pub/linux/kernel/people/mcgrof/patches/ath9k/2009-03-12/serialization-v6/for-2.6.29/

  Luis
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