Re: [Xen-ia64-devel] I cannot create domU anymore

[Tristan Gingold <tgingold@xxxxxxx>]

On Sun, Jun 17, 2007 at 08:43:37AM -0600, Alex Williamson wrote:
> On Sun, 2007-06-17 at 07:59 +0200, Tristan Gingold wrote:
> > Hi,
>    That's coming from the swiotlb code.  By default a domU will use the
> xen machine vector, which relies on xen_dma instead of swiotlb for DMA.
> However, if you boot a domU with machvec=dig it will make use of the
> swiotlb.  This works for me, but is really only useful if you're running
> driver domains with 32bit devices, which isn't really recommended.
> Could that be the case?  Unfortunately there's a limited amount of
> memory below 4G for xen to remap.  Maybe the default size of the swiotlb
> should be smaller if running in a domU?  Thanks,

Thank you for the info.
I didn't add any machvec= option and I don't try to run a driver domain.
I will try to understand whu swiotlb is used instead of xen_dma.

Tristan.

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