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


  • To: Stefan Berger <stefanb@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Fri, 07 Sep 2007 19:42:29 +0100
  • Delivery-date: Fri, 07 Sep 2007 11:43:02 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcfxftetFkzYnl1yEdybXQAX8io7RQ==
  • Thread-topic: [Xen-devel] Xen linux error message: PCI-DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:02:01.0

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.

 -- 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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