Re: svn commit: r210550 - in head/sys: amd64/include arm/include i386/include ia64/include mips/include powerpc/include sparc64/include sun4v/include sys vm

On Tuesday, July 27, 2010 4:33:50 pm John Baldwin wrote:
> Author: jhb
> Date: Tue Jul 27 20:33:50 2010
> New Revision: 210550
> URL: http://svn.freebsd.org/changeset/base/210550
> 
> Log:
>   Very rough first cut at NUMA support for the physical page allocator.  For
>   now it uses a very dumb first-touch allocation policy.  This will change in
>   the future.

A couple of notes:

1) This is not enabled by default.  If you want to try it out on x86, you will
   need the subsequent commit to add the SRAT parser.  You will then need to
   edit <machine/vmparam.h> and change VM_NDOMAIN to some value > 1.  I have
   been using 4 in my testing.  I've only tested it on amd64, but I have tested
   it both with dual-socket Opteron and i7 systems.  The reason this is not
   enabled by default is that first-touch is a horrible default policy for all
   but a few very specific workloads. :)
2) There is much more work to be done here to have truly useful NUMA support.
   The main reason for committing this now is that several folks have started
   looking at NUMA and it's easier to work on the various different projects
   with the baseline in the tree.  I'm hoping we can at least commit a tweak
   to use a saner default policy for allocations rather than first-touch
   relatively soon.

--

-- 
John Baldwin
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