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