Re: [Xen-devel] Xen Kernel (3.0.2) breaks b44 module

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 May 2006, at 10:15, Jan Beulich wrote:

> I agree, but this wouldn't help this specific case, as the driver also 
> (and mostly) uses pci_map_single on skb->data,
> which ends up in swiotlb. Since swiotlb does its allocation and range 
> restriction during init, adjusting things here
> would likely be more complicated (or cost performance, if one wanted 
> to further restrict the range upon use when
> needed).
When we support more flexible allocation in Xen, we'll fix up the 
swiotlb to automatically try to grab some lower memory and/or allow the 
address mask for the physical memory in the swiotlb to be specified on 
the kernel command line.
It sounds like 30-bit-addressable memory will be a good thing to try 
for automatically at init. I'd thought that 31-bit was really as bad as 
it got (except for old ISA-ish hardware with 24-bit limitations, which 
we'll never support).
 -- Keir


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