Francois Tigeot has done another set of benchmarks using blogbench to test reading and writing under different DragonFly versions, plus some OpenIndiana benchmarks just to mix it up.  Writing performance seems to have drastically improved between DragonFly 2.10 and 2.11.

His post has an attached PDF with, of course, graphs.  This site has previously mentioned other not-really-comparable disk testing performed by Francois.