Re: x86_64: 2.6.14-rc4 swiotlb broken

[Ravikiran G Thirumalai <kiran@scalex86.org>]

On Mon, Oct 17, 2005 at 08:27:40AM -0700, Linus Torvalds wrote:
> 
> 
> 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+)?

That's the reason I made a small patch.  It does work on the boxes we use.
But I like Yasunori-san's patch.  Mine is just a chewing gum fix.

Thanks,
Kiran