@ahrens @pcd1193182 can either of you comment on the performance of this? from 
what I remember, it was a little complicated, due to some other bottlenecks 
that we haven't yet pushed fixes for.

looking at our internal review, it says this patch increased performance from 
~9300 MB/s to ~11200 MB/s; but that was tested with some other experimental 
patches to address bottlenecks elsewhere on the system. without these 
additional patches, the performance improvement was modest, going from ~5810 
MB/s to 5870 MB/s. with that said, I think the bottlenecks seen elsewhere might 
be illumos specific, so it'd be interesting to get results from another 
platform.

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