IMO the whole area of SLRU buffering is in horrible shape and many users are struggling with overall PG performance because of it. An improvement doesn't have to be perfect -- it just has to be much better than the current situation, which should be easy enough. We can continue to improve later, using more scalable algorithms or ones that allow us to raise the limits higher.
The only point on which we do not have full consensus yet is the need to have one GUC per SLRU, and a lot of effort seems focused on trying to fix the problem without adding so many GUCs (for example, using shared buffers instead, or use a single "scaling" GUC). I think that hinders progress. Let's just add multiple GUCs, and users can leave most of them alone and only adjust the one with which they have a performance problems; it's not going to be the same one for everybody. -- Álvaro Herrera 48°01'N 7°57'E — https://www.EnterpriseDB.com/ "Sallah, I said NO camels! That's FIVE camels; can't you count?" (Indiana Jones)
