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| author | Mike Christie <michael.christie@oracle.com> | 2026-02-23 02:27:04 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2026-03-01 05:04:03 +0300 |
| commit | a4d72d2dd0cbc3ff20f66a9168dd68b191c57409 (patch) | |
| tree | d71ac57ff10d57a234b92c9e2e717b9b17c97b67 | |
| parent | e1502d990c8e26fa679b3253ff7db51483e6eb82 (diff) | |
| download | linux-a4d72d2dd0cbc3ff20f66a9168dd68b191c57409.tar.xz | |
scsi: vhost-scsi: Report direction completion support
This has vhost-scsi report that it supports direct completions.
When using a worker task per queue or group of queues with fast backends
then enabling direct completion and submissions increases performance
20-30% with workloads like:
fio --filename=/dev/sdb --direct=1 --rw=randrw --bs=8K \
--ioengine=libaio --iodepth=128 --numjobs=$jobs
As jobs matches and passes the number of vCPUs in the VM then the
benefit increases.
However, when using a single worker then queueing completions and
submissions is best as the worker is busy handling mapping data and
setting/tearing down commands.
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://patch.msgid.link/20260222232946.7637-5-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/vhost/scsi.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 903d4c5be2b2..9a1253b9d8c5 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -2951,6 +2951,7 @@ static const struct target_core_fabric_ops vhost_scsi_ops = { .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, .default_compl_type = TARGET_QUEUE_COMPL, + .direct_compl_supp = 1, .default_submit_type = TARGET_QUEUE_SUBMIT, .direct_submit_supp = 1, }; |