Messages in this thread | | | Date | Wed, 5 Mar 2003 14:02:57 +0100 | From | Michael Vergoz <> | Subject | Re: High Mem Options |
| |
Hi William,
Right, but if the pagetable pointing to a different 4GB subsets of memory. The performance of the system can be disastrous, not?
Best regards, Michael
On Wed, 5 Mar 2003 04:57:47 -0800 William Lee Irwin III <wli@holomorphy.com> wrote:
> On Wed, Mar 05, 2003 at 01:49:37PM +0100, Michael Vergoz wrote: > > That i can't understand i when the system going to the protect mode. > > How the system can use over 4GB memory ? > > On freebsd, when you have over 4GB the system say "XGB of XGB skiped..." > > (i'v got a machine with 8GB running on freebsd and without memory spare) > > The cpu can't look at more than 4GB at a time. > > Protected mode doesn't help this, turning paging on and PAE on does. > > What it can do is point pagetables at different 4GB subsets of memory. > > c.f. kmap_atomic() for how to window around using what's actually a > very small set of PTE's. > > > -- wli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |