Messages in this thread | | | Date | Mon, 2 Apr 2007 15:37:56 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL |
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On Tue, 3 Apr 2007, Andi Kleen wrote:
> If it works I would be inclined to replaced old sparsemem with Christoph's > new one on x86-64. Perhaps that could cut down the bewildering sparsemem > ifdef jungle that is there currently. > > But I presume it won't work on 32bit because of the limited address space?
Not in general but it will work in non PAE mode. 4GB need 2^(32-21+4) = 16MB pages. This would require the mapping on 4 4MB pages.
For 64GB you'd need 256M which would be a quarter of low mem. Probably takes up too much of low mem.
> > But, without some cold, hard, data, we mere mortals without the 1024-way > > machines can only guess. ;) > > Yep. > > -Andi (who would be scared of a 1024 way x86 machine)
- Christoph (who does not believe that Andi has to wait long for something bigger)
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