Re: x86_64: 2.6.14-rc4 swiotlb broken

On Mon, 17 Oct 2005, Andi Kleen wrote:
> 
> The patch is actually not quite correct - in theory node 0 could be too small 
> to contain the full swiotlb bounce buffers.

Is node 0 guaranteed to be all low-memory? What if it allocates stuff at 
the end of memory on NODE(0)?

Anyway, it sounds like "alloc_bootmem_low_pages()" is seriously buggered 
if it allocates non-low pages, if only because of its name...

> The real fix would be to get rid of the pgdata lists and just walk the 
> node_online_map on bootmem.c. The memory hotplug guys have
> a patch pending for this.

Argh. Which one should I pick? The NODE(0) one looks simpler, but is it 
sufficient for now in practice (with the real one going into 2.6.14+)?

                Linus