Hello list,

while running the same workload on two machines (single xeon and a dual
xeon) both with 64GB RAM.

I need to run echo 3 >/proc/sys/vm/drop_caches every 15-30 minutes to
keep the speed as good as on the non numa system. I'm not sure whether
this is related to numa.

Is there any sysctl parameter to tune?

Tested with vanilla v4.8.1

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