Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> Aside from that my pgbench testing clearly shows that block sizes larger
> than 2048 become progressively slower. Go figure.
I believe that pgbench only stresses the "small writes" case, so
perhaps this result isn't too surprising. You'd want to look at a mix
of small and bulk updates before drawing any final conclusions.
regards, tom lane