Re: Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?]

[Gerrit Huizenga]

In message <3971861785.1020330424@[10.10.2.3]>, > : "Martin J. Bligh" writes:
> > With numa-q there's a 512M hole in each node IIRC. that's fine
> > configuration, similar to the wildfire btw.
> 
> There's 2 different memory models - the NT mode we use currently
> is contiguous, the PTX mode is discontiguous. I don't think it's
> as simple as a 512Mb fixed size hole, though I'd have to look it
> up to be sure.

No - it definitely isn't as simple as a 512 MB hole.  Depends on how much
memory is in each node, holes could be all kinds of sizes.  You could,
in theory, have had 128 MB in one node and 8 GB in another node.  I don't
think we had holes within the node from the software side - I think the
requirement was that all DIMMS were added in low to high memory slots.
Not sure what forced that requirement - could have been PTX, BIOS,
cache controllers, etc.

gerrit