Messages in this thread | | | Date | Mon, 11 Jun 2007 20:01:38 +0200 | From | Rene Herman <> | Subject | Re: [PATCH] move the kernel to 16MB for NUMA-Q |
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On 06/11/2007 07:58 PM, H. Peter Anvin wrote:
> Rene Herman wrote: >> Aligning the kernel image on 4M could gain an additional TLB entry if >> the kernel image would fit in one (4M aligned) hugepage, but not in the >> 3M that's left after loading the kernel at 1M physical. And that stuff >> about the MTRRs... >> > > Yup. Most CPUs won't actually use a largepage for the kernel if it's > below 4 MB (2 MB with PAE, so that's what x86-64 uses.)
Oh, thanks, that's interesting. Had no idea. In those cases it would seem to at least potentially be a serious performance issue.
Rene.
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