Re: [Xen-devel] Xen linux error message: PCI-DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:02:01.0

[Stefan Berger <stefanb@xxxxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 09/07/2007
02:42:29 PM:

> No, you simply don’t have a big enough swiotlb. The default is 2MB
> for a machine with less than 2GB of RAM, or 64MB for >2GB systems.
> 
> You can change to e.g., a 128MB swiotlb by putting ‘swiotlb=128’
on 
> you dom0 cmdline.

Not that I find this a good or intuitive solution,
but at least now the error messages have disappeared. Couldn't this swiotlb
grow automatically when needed?

   Stefan

> 
>  -- Keir
> 
> On 7/9/07 18:51, "Stefan Berger" <stefanb@xxxxxxxxxx>
wrote:

> 
> One one of my machines running the linux 2.6.18 changes 195, I see
a
> lot of these errrors. 
> 
> Sep  7 13:14:22 test-11 kernel: PCI-DMA: Out of SW-IOMMU space
for 
> 65536 bytes at device 0000:02:01.0
> Sep  7 13:14:22 test-11 last message repeated 10 times
> Sep  7 13:14:25 test-11 kernel: PCI-DMA: Out of SW-IOMMU space
for 
> 16384 bytes at device 0000:02:01.0
> Sep  7 13:14:25 test-11 last message repeated 4 times
> Sep  7 13:14:25 ttest-11 kernel: PCI-DMA: Out of SW-IOMMU space
for 
> 24576 bytes at device 0000:02:01.0
> 
> Was this patch 
> 
> http://lists.xensource.com/archives/html/xen-devel/2007-07/msg00418.html
> 
> supposed to solve this? 
> 
>    Stefan
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