On Sat, Oct 09, 2021 at 12:19:03AM +0000, Hyeonggon Yoo wrote: > - Is there a reason that SLUB does not implement cache coloring? > it will help utilizing hardware cache. Especially in block layer, > they are literally *squeezing* its performance now. Have you tried turning off cache colouring in SLAB and seeing if performance changes? My impression is that it's useful for caches with low associativity (direct mapped / 2-way / 4-way), but loses its effectiveness for caches with higher associativity. For example, my laptop: L1 Data Cache: 48KB, 12-way associative, 64 byte line size L1 Instruction Cache: 32KB, 8-way associative, 64 byte line size L2 Unified Cache: 1280KB, 20-way associative, 64 byte line size L3 Unified Cache: 12288KB, 12-way associative, 64 byte line size I very much doubt that cache colouring is still useful for this machine.
