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Tweak performance of nda completions

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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.

Sponsored by: Netflix
Suggested by: scottl@
This commit is contained in:
Warner Losh 2017-09-28 01:27:00 +00:00
parent bd290946e9
commit cfb43eb12e
1 changed files with 5 additions and 3 deletions
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8
sys/dev/nvme/nvme_sim.c
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@ -73,11 +73,13 @@ nvme_sim_nvmeio_done(void *ccb_arg, const struct nvme_completion *cpl)
* it means. Make our best guess, though for the status code.
*/
memcpy(&ccb->nvmeio.cpl, cpl, sizeof(*cpl));
if (nvme_completion_is_error(cpl))
if (nvme_completion_is_error(cpl)) {
ccb->ccb_h.status = CAM_REQ_CMP_ERR;
else
xpt_done(ccb);
} else {
ccb->ccb_h.status = CAM_REQ_CMP;
xpt_done(ccb);
xpt_done_direct(ccb);
}
}
static void