More fine-grained NUMA knobs

[Jack Vogel]

Cool! Glad to see this happening :)



On Tue, Mar 22, 2016 at 8:15 PM, Adrian Chadd <adrian.chadd at gmail.com>
wrote:

> +1 by me!
>
>
> -a
>
>
> On 22 March 2016 at 17:13, John Baldwin <jhb at freebsd.org> wrote:
> > Some of the I/O device affinity stuff such as bus_get_domain() (and the
> > bus_get_cpus() I have in review in D5519) are useful on their own right
> even
> > if the VM system is not doing NUMA-aware allocations.  I think it would
> be
> > useful to be able to enable these two "prongs" of NUMA awareness
> > independently.  To that end, I have a little strawman patch that adds two
> > new kernel options: VM_NUMA_ALLOC and DEVICE_NUMA.  I actually think it
> is
> > probably worth enabling DEVICE_NUMA by default on x86 (and bumping the
> > default MAXMEMDOM to, say, 8 (quad-socket haswell)).
> >
> > You can see the simple patch at:
> >
> > https://github.com/bsdjhb/freebsd/compare/master...bsdjhb:numa_opts
> >
> > Thoughts?
> >
> > --
> > John Baldwin
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