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) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
