On Fri, May 31, 2024 at 12:05:48AM -0600, Yu Zhao wrote: [...] > All optimizations in v2 were measured step by step. Even that bitmap, > which might be considered overengineered, brought a readily > measuarable 4% improvement in memcached throughput on Altra Max > swapping to Optane: That's great, but taking an iterative approach to the problem allows the reviewers and maintainers to come to their own conclusions about each optimization independently. Squashing all of that together and posting the result doesn't allow for this. Even if we were to take the series as-is, the door is wide open to subsequent improvements. > What I don't think is acceptable is simplifying those optimizations > out without documenting your justifications (I would even call it a > design change, rather than simplification, from v3 to v4). No, sorry, there's nothing wrong with James' approach here. The discussion that led to the design of v4 happened on list; you were on CC. The general consensus on the KVM side was that the bitmap was complicated and lacked independent justification. There was ample opportunity to voice your concerns before he spent the time on v4. You seriously cannot fault a contributor for respinning their work based on the provided feedback. -- Thanks, Oliver
