Jeff Janes <> writes:
> commit 1aba62ec made zero be an illegal value for effective_io_concurrency.
> i think this was an accident.  If not, then the sample postgresql.conf
> (at least) needs to be updated.

It looks like the problem is that the new range check

+   /* This range check shouldn't fail, but let's be paranoid */
+   return (new_prefetch_pages > 0.0 && new_prefetch_pages < (double) INT_MAX);

should be testing for >= 0.0 not > 0.0.

                        regards, tom lane

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