Yes, that's a killer: ordered tags aren't going to be able to enforce cross
device write barriers.
There is one remaining curiosity I have, at least about the benchmarks: Since
the linux elevator and tag queueing perform essentially similar function
(except that the disk itself has a better notion of ordering because it knows
its own geometry). Might we get better performance by reducing the number of
tags we allow the device to use, thus forcing the writes to remain longer in
the linux elevator?
James
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