On Thu, Dec 08, 2005 at 03:19:36PM -0800, Christoph Lameter wrote:
> On Thu, 8 Dec 2005, Andi Kleen wrote:
>
> > I would use > LOCAL_DISTANCE or perhaps if you really want
> > a new constant with value 12-15.
>
> One may define RECLAIM_DISTANCE to be 12 for x86_64 in topology.h
> in order to get zone reclaim earlier for the opteron clusters. I would
> think though that large opteron clusters also have distances > 20.
>
> My experience is that at 20 systems do not need zone reclaim yet.
I really cannot confirm your experience here.
>
> > > RECLAIM_DISTANCE can be set per arch if the default is not okay.
> >
> > Well if anything it would be per system - perhaps need to make
> > it a boot option or somesuch later.
>
> The idea here was to avoid any manual configuration. The numa distances
Sure as a default this makes sense.
I'm just questioning your default values.
> must related in some real way to performance (at least per arch) in order
> for the automatic determination of zone reclaim to make sense. We could
> have a boot time override but then RECLAIM_DISTANCE needs to be a
> variable not a macro.
The macro can be always later defined to a variable, no problem.
-Andi
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