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H A Dnvme_sim.cdiff cfb43eb12e67c218e7fa211e5c92460553f17bf6 Thu Sep 28 03:27:00 CEST 2017 Warner Losh <imp@FreeBSD.org> Tweak performance of nda completions

Use xpt_done_direct in preference to xpt_done when completing a
successful I/O. Continue to use xpt_done when there's an error, or for
completion of the submission of a CCB. This eliminates a context
switch to the cam_doneq thread.

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Suggested by: scottl@