On Sat, Jan 24, 2009 at 11:46 AM, Stefan Reinauer stepan@coresystems.de wrote:
This sounds neat, we're going to need it. An interesting test for now would be to artificially limit memory size to that which can be described with 4 MTRRs. We would lose 200M or so that way but it would be helpful to see if that resolves the speed problem.
How would we lose 200M? The above example only requires 3 MTRRs?
I was not clear. What I meant was that we could test the 'it's an mtrr problem' assertion by using 3 MTRRs for positive decoding of most of memory, but not the last little bit,and then reporting that we only have that memory covered by MTRRs.
put another way: simple test: hardwire TOM to 1 GB, and see if booting gets better, since one MTRR will cover that.
What do MTRRs look like on this board on factory BIOS?
ron