Re: [PATCH] bootmem: avoid DMA32 zone by default

From: Jiri Slaby
Date: Wed Jan 20 2010 - 18:12:31 EST

On 01/20/2010 11:53 PM, Johannes Weiner wrote:
> I cc'd stable because this affects already released kernels. But since this is
> the first report of DMA32 memory exhaustion through bootmem that I hear of,

Just for how the setup look like:
128G of RAM, flat mapping
sizeof(struct page)=56
0-1.75G mem_map
1.75-2G vfs caches, console and others. initrd reservation
2-4G reserved by BIOS

Kernel panics with out of memory when swiotlb tries to allocate 64M of
"low" bootmem.

suse labs
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