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scsi: vhost-scsi: Report direction completion support

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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>
This commit is contained in:
Mike Christie
2026-02-22 17:27:04 -06:00
committed by Martin K. Petersen
parent e1502d990c
commit a4d72d2dd0
1 changed files with 1 additions and 0 deletions
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drivers/vhost/scsi.c
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@@ -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,
};