Hmm. I turned on /sys/module/dm_mod/parameters/use_blk_mq and indeed
saw a significant performance improvement. Anything else I was missing?
You can enable CONFIG_DM_MQ_DEFAULT so you don't need to manually set
use_blk_mq.
I do, I started out with the manual option to test the improvements but
got tired of it very quickly :)
OK, so you're only getting 1/3 of the throughput. Time for us to hunt
down the bottleneck (before real devices hit it).
I have some initial instrumentation analysis so I'll be happy if we can
work on that (probably can free this thread and move it to dm-devel).
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