Sat Jul 14 17:41:06 PDT 2007
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From: "Simon 'corecode' Schubert" <corecode at fs.ei.tum.de>
Subject: Re: 4mb PAGES for mbuf clusters
Date: Sun, 15 Jul 2007 02:39:26 +0200
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Matthew Dillon wrote:
> :Thomas E. Spanjaard wrote:
> :>>> Is not the large pages necessary for 64 GB memory support ?
> :>> no. and PAE is stupid, so we won't do that. it's really stupid.
> :> Actually, we will do that. Perhaps not on x86-32, but it sure is a
> :> requirement for 64bit long mode on x86-64...
> :what is? PAE is not, just the 4-level page table.
> Nothing wrong with the 4-level page table. It's designed so you
> can assign address spaces their own independant page table directories.
> So, for example, the kernel would no longer need to stuff all the
> kernel's PTEs into each user page table in order to keep the kernel
yah, and you simply need it to address more than 4GB.
> Besides, pretty much all the levels except the last are cached.
but they will be flushed on a task switch, right? We should check out that GLOBAL PTE flag which prevents TLB entries to be flushed.
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