Messages in this thread | | | Date | Wed, 7 Aug 2013 20:49:41 -0700 (PDT) | From | David Rientjes <> | Subject | Re: [PATCHv2] Add per-process flag to control thp |
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On Tue, 6 Aug 2013, Alex Thorlton wrote:
> I've gotten my hands on some of the benchmarks/code that were used to > originally uncover the performance issues we're seeing. I'm currently > trying to separate out the performance issues that are being caused by > the kernel code from issues involving hardware - the cost of remote > memory accesses is a bit higher on our systems with node controllers vs. > glueless QPI/Hypertransport-based systems. >
We've seen some issues where accessing remote hugepages causes performance degradations over accessing local pages that affects some workloads, but that seems like a mempolicy issue rather than madvise. You probably want local hugepages but not fallback to remote hugepages before allocating local pages? It would be interesting to see /proc/pid/numa_maps and /proc/pid/smaps for workloads that don't like thp.
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