K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2018-08-03T20:04:06.075778Z
K 7
svn:log
V 654
nvme(4): Add bus_dmamap_sync() at the end of the request path

Summary:
Some architectures, in this case powerpc64, need explicit synchronization
barriers vs device accesses.

Prior to this change, when running 'make buildworld -j72' on a 18-core
(72-thread) POWER9, I would see controller resets often.  With this change, I
don't see these resets messages, though another tester still does, for yet to be
determined reasons, so this may not be a complete fix.  Additionally, I see a
~5-10% speed up in buildworld times, likely due to not needing to reset the
controller.

Reviewed By: jimharris
Differential Revision: https://reviews.freebsd.org/D16570

END