On Fri, Feb 07, 2025 at 06:20:09PM -0800, Andrew Morton wrote: > On Fri, 7 Feb 2025 12:13:35 -0800 Joshua Hahn <joshua.hahnjy@xxxxxxxxx> wrote: > > Leading to... how do we know that this patch makes the kernel better? Just focusing on this question: The default behavior of weighted interleave without this patch is equivalent to normal interleave. This provides a differentiation out-of-the box, and that's just a better experience. We may find the default values / calculations need tweaking in the future, but this gives us a good starting point. Anecdotally, I've seen an "optimal" distribution of 10:1 based on the numbers run sub-optimally compared to 7:1 or 13:1 (but better than default mempol). So there will always be a "try it and see" component to this. (Not to mention hardware/firmware lies regularly, and their reported performance numbers rarely if ever match their tested numbers - so *at best* this can be considered a best-effort feature) ~Gregory
