Re: [2.6.20.16 review 08/28] x86_64: allocate sparsemem memmap above 4G

[Andi Kleen]

On Saturday 11 August 2007 21:48, Willy Tarreau wrote:
> On systems with huge amount of physical memory, VFS cache and memory memmap
> may eat all available system memory under 4G, then the system may fail to
> allocate swiotlb bounce buffer.
>
> There was a fix for this issue in arch/x86_64/mm/numa.c, but that fix dose
> not cover sparsemem model.

Have you checked if sparsemem even worked in 2.6.20? Irc it was quite
unstable a couple of releases ago. There were times where it rarely
booted on x86-64 because so few people test it. 
If not the patch is not needed, although relatively harmless too.

-Andi
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