Run "numastat". If you only see one "node" column, then these issues don't affect you. At Netflix, almost all our systems are single NUMA node.

I tested the patches on 1 and 2 node NUMA, and saw 0% performance improvements, for some simple workloads.

The paper is also uninformed about scheduler bugs in general. Yes, there have been lots of scheduler bugs (I've worked on more in other kernels too, not Linux, where scheduling is even worse!). Yes, we already have tools for diagnosing them (eg, examining run queue latency as a histogram). Yes, we've already used visualizations too.

There's information for reproducing the bugs here: https://github.com/jplozi/wastedcores/issues/1 . If you think for a second that you've hit these bugs, you should read these steps.