Workload: sysbench OLTP write-only, i.e. as it is used by the regression benchmark suite in t_writes_innodb_multi.
Setup: 16G buffer pool. 4G redo log. 4G or 8G data set. innodb_flush_neighbors = 0, innodb_io_capacity = 1000 (or 5000, 10000)
Observation: after starting high, performance drops after ~ 1 minute. If waiting long enough, one can see oscillations in throughput. This seems to be related to Innodb_checkpoint_age reaching Innodb_checkpoint_max_age. There seems to be no LRU flushing at all, only flush_list flushing.