Created attachment 802895 [details] Jan's results from comment 1 to 14 compiled into a plot For my future quick reference, all Jan's tables into a single plot. Considering mainly the cases of 1, 2 and 4 clients. One thing that surprises me is that the LEAP-15 kernel from comment #10 is considerably worse than the SLE-15-SP1 kernel (comment #1, first column). Those two should be basically the same kernel. It isn't specified in the previous comments, but I'm assuming that the userspace for all measurement was LEAP-15 (as it is in the marvin dashbord from which this regression was noticed).