The regression being the drop in performance you saw? I don't know.. I'd be interested in seeing what the performance looks like on multiple "identical" C4.X8L

The regression being the drop in performance you saw? I don't know.. I'd be interested in seeing what the performance looks like on multiple "identical" C4.X8LARGE instances, regardless of KPTI. If you mean their results.. they actually show an increase in perf in later kernel versions. Based on https://github.com/phoronix-test-suite/test-profiles/tree/master/pts/redis-1.0.0 https://github.com/phoronix-test-suite/test-profiles/tree/ma... it looks like they just use the default configuration and run the benchmark with -n 1000000 -P 32 -q -c 50 --csv