Tweaking Ubuntu 17.10 To Try To Run Like Clear Linux
Even with the overhead of having both KPTI and Retpoline kernel support in place, our recent Linux distribution benchmarks have shown Intel's Clear Linux generally outperforming the more popular distributions. But if applying some basic performance tweaks, can Ubuntu 17.10 perform like Clear Linux? Here are some benchmarks looking at a few factors.
In our forums there were recently some users attributing the Clear performance benefit to their CFLAGS and the distribution defaulting to the P-State "performance" governor rather than the "powersave" governor. It's true those are two of the ways this Intel open-source platform tries to deliver better out-of-the-box performance, but that is not all. Explained at ClearLinux.org, they also apply automatic feedback-driven optimizations (GCC FDO), function multi-versioning (FMV) to deliver optimized functions selected at run-time based upon the CPU micro-architecture being used, and various other approaches for trying to deliver the best out-of-the-box Linux performance that does include backporting various patches, etc. And, yes, hopefully this article can provide some motivation for Ubuntu and other distributions to become a bit more aggressive with their defaults to deliver a more optimized experience on installation.
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