In a setup with high-level of containers collocation on large ec2 instances, we've seen the opposite behavior at Netflix: default CFS performing badly. We've AB

In a setup with high-level of containers collocation on large ec2 instances, we've seen the opposite behavior at Netflix: default CFS performing badly. We've AB tested our flavor of custom pinning and measured substantial benefits: https://netflixtechblog.com/predictive-cpu-isolation-of-containers-at-netflix-91f014d856c7?gi=e6db18b17ff9 https://netflixtechblog.com/predictive-cpu-isolation-of-cont... PMC data at scale is pretty clear: very often, CFS won't do the right thing and will leave bad HT neighbors on the same core, leading to L1 thrashing, or keep a high-level of imbalance between NUMA sockets leading to degraded LLC hit rate.