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. We have had significant issues with thp, for example, being allocated remotely instead of pages locally, much more drastic than on our x86 machines, particularly AMD machines. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
