David Laight wrote:
On Tue, Nov 06, 2007 at 06:39:38PM -0500, Greg Troxel wrote:
"Steven M. Bellovin" <smb@xxxxxxxxxxxxxxx> writes:
Some time back, a change was made (by Greg Troxel, I thought) so that
rbus was calculated automatically. It doesn't seem to happen on
amd64. I have 3GB machine; here's what happened:
That's what I'd expect - I put the heuristic in the i386 machdep code.
If you want to add it for amd64, or a different one that matches those
platforms, that sounds sensible. We could also have a common ruotine
somewhere, since i386 and amd64 seem to share a lot.
But, with amd64 having more address space, the whole notion of using 1G
or 2G as the rbus place seems odd.
It may have more address space, but there is still a physical address
boundary at 4GB.
David, can you provide some insight into that?
FWIW I several TYAN (and Supermicro, I think) Allow the phyiscal memory
to be set to continuous or discrete.
I'm otherwise unaware of any boundaries besides the physical address
size, but there's generally a lot that I'm unaware of :-).
skd
David
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