hi, list. there are my proposal. i would like to tell about odirect in wal sync in wal_level is higher than minimal. i think in my case when wal traffic is up to 1gb per 2-3 minutes but discs hardware with 2gb bbu cache (or maybe ssd under wal) - there would be better if wall traffic could not harm os memory eviction. and i do not use streaming. my archive command may read wal directly without os cache. just opinion, i have not done any tests yet. but i am still under the some memory eviction anomaly.