On Wed, May 18, 2005 at 09:43:48AM -0700, Matt Tolentino wrote:
> >From: Andi Kleen <[email protected]>
> >On Wed, May 18, 2005 at 08:24:41AM -0700, Matt Tolentino wrote:
> >>
> >> Add the requisite arch specific Kconfig options to enable
> >> the use of the sparsemem implementation for NUMA kernels
> >> on x86-64.
> >
> >How much did you test sparsemem on x86-64 NUMA ?
> >
> >There are various cases that probably need to be checked,
> >AMD with SRAT, AMD without SRAT, AMD with more than 4GB RAM,
> >Summit(?), NUMA EMULATION etc.
> >
> >If all that works I would have no problem with removing the
> >old code.
>
> As my disclaimer said, this has only been tested using
> the NUMA EMULATION config option. That's a big part of
> the reason for sending this out - to get further testing
> on real x86-64 NUMA systems, but without breaking the
> current discontigmem code.
Hmm, I would have assumed IBM tested it, since Dave Hansen signed off -
they have a range of Opteron machines. If not I can test it
on a few boxes later.
A single box is not enough, there are various special cases.
e.g. one area I've been fighting with is that
with SRAT and 3+GB memory the nodes don't span the PCI memory
hole anymore, and when there is a virt_to_page() or similar for these
addresses things go wrong because they do a uninitialized hash
table lookup. If it's not that hard and doesn't cause code bloat
I would recommend to harden sparsemem against this case, at least for
upto 4GB.
-Andi
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