These raw tps suggest that {backend,bgwriter}_flush_after should better be
zero for this kind of load.Whether it should be the default is unclear yet,
because as Andres pointed out this is one kind of load.

FWIW, I don't think {backend,bgwriter} are the same here. It's primarily
backend that matters.

Indeed, I was a little hasty to put bgwriter together based on this report.

I'm a little wary of "bgwriter_flush_after" though, I would not be surprised if someone reports some regressions, although probably not with a pgbench tpcb kind of load.


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