Re: Cost of XLogInsert CRC calculations

"Mark Cave-Ayland" <m.cave-ayland@webbased.co.uk> writes:
> Opt    32     32a    32b    2x32   64     64a      64b
> --------------------------------------------------------
> O1    4.91   4.86   5.43   6.00   11.4   11.39    11.39
> O2    4.96   4.94   4.69   5.18   15.86  18.75    24.73
> O3    4.82   4.83   4.64   5.18   15.14  13.77    14.73

Not sure I believe these numbers.  Shouldn't 2x32 be about twice as slow
as just one 32-bit CRC?
        regards, tom lane