It's probably mixed. For low-throughput workloads, probably it reduces 
locality. For high-throughput systems, my understanding is that in the steady 
state, you're switching between metaslabs during a txg anyway, so the effect is 
reduced significantly.  One thing we could do is change the default of 
spa_allocators down to 1 or 2, to reduce the odds of harm; people could then 
tune it up if they think it would give them more performance.

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