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    SubjectRe: ppc: RECLAIM_DISTANCE 10?
    On Wed 19-02-14 00:20:21, David Rientjes wrote:
    > On Wed, 19 Feb 2014, Michal Hocko wrote:
    >
    > > > I strongly suspect that the patch is correct since powerpc node distances
    > > > are different than the architectures you're talking about and get doubled
    > > > for every NUMA domain that the hardware supports.
    > >
    > > Even if the units of the distance is different on PPC should every NUMA
    > > machine have zone_reclaim enabled? That doesn't right to me.
    > >
    >
    > In my experience on powerpc it's very correct, there's typically a
    > significant latency in remote access and we don't have the benefit of a
    > SLIT that actually defines the locality between proximity domains like we
    > do on other architectures.

    Interesting. So is the PPC NUMA basically about local vs. very distant?
    Should REMOTE_DISTANCE reflect that as well? Or can we have
    distance < REMOTE_DISTANCE and it would still make sense to have
    zone_reclaim enabled?

    [...]

    Thanks!
    --
    Michal Hocko
    SUSE Labs


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