Messages in this thread | | | Date | Mon, 16 Mar 2009 12:37:05 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [Xen-devel] [PATCH 10/27] xen: make sure swiotlb allocation isphysically contigious |
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Jan Beulich wrote: > > While on native using alloc_bootmem_low_pages() is a requirement here, > on Xen this should explicitly not be used, as we realized just a couple of > days ago:
Which conversation was this?
> The way the bootmem allocator works, running out of space > below 4Gb is pretty easy on machines with lots of memory, and since the > swiotlb is a requirement for Dom0, the risk of allocation failures must be > kept as low as possible. >
Are we talking about a 32 or 64 bit dom0 here? If its 32-bit, then yes, low memory is a precious resource, but I don't see why that depends on the total amount of memory. And if its 64-bit, why is below-4G particularly constrained? That would only matter for 32-bit devices?
J
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