Re: [PATCH ] VMSPLIT config options (with default config fixed)

[Barry K. Nathan]

On 1/11/06, Mark Lord <lkml@xxxxxx> wrote:
> Greg Norris wrote:
> > Is there any benefit/point to enabling HIGHMEM when using this patch,
> > assuming that physical memory is smaller than the address space?  For
> > example, when using VMSPLIT_3G_OPT on a box with 1G of memory.
>
> No.  In fact, there should be a (very) tiny performance gain
> by NOT enabling HIGHMEM -- things like kmap() should get simpler.

Actually, IIRC if you have an x86 CPU (or x86-64 running a 32-bit
kernel) which has a no-execute bit, to support that (i.e. to have a
more secure system) you need to use HIGHMEM64G, no matter how much or
how little RAM you have.
--
-Barry K. Nathan <barryn@xxxxxxxxx>
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