If you recall, Phoronix recently ran a bunch of benchmarks on DragonFly. One spot that didn’t look good was the “Himeno Poisson Pressure Solver”. I’m no closer to knowing what capability it actually tests other than itself, but Alex Hornung, Matt Dillon, and Venkatesh Srinivas figured out that cache coloring was the missing ingredient. DragonFly now scores the same as Linux.
Tangentially related, this cache coloring is happening in nmalloc, which is now used on 64-bit DragonFly systems. The previous one, dmalloc, had problems in long-running programs.