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authorStefan Hajnoczi <stefanha@redhat.com>2020-08-18 15:33:46 +0100
committerMichael S. Tsirkin <mst@redhat.com>2020-08-27 08:29:13 -0400
commit6a558822849fab604a1fcb71e7c4e528cafa21d9 (patch)
treebaeec7fcfa10f0b0ff3a3290c614453adc0f5e02 /hw/scsi/vhost-scsi.c
parent4e5163bd844429711b4d60d51030ab83048d80cd (diff)
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virtio-scsi-pci: default num_queues to -smp N
Automatically size the number of virtio-scsi-pci, vhost-scsi-pci, and vhost-user-scsi-pci request virtqueues to match the number of vCPUs. Other transports continue to default to 1 request virtqueue. A 1:1 virtqueue:vCPU mapping ensures that completion interrupts are handled on the same vCPU that submitted the request. No IPI is necessary to complete an I/O request and performance is improved. The maximum number of MSI-X vectors and virtqueues limit are respected. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20200818143348.310613-6-stefanha@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/scsi/vhost-scsi.c')
-rw-r--r--hw/scsi/vhost-scsi.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 13b05af..a83ffee 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -270,7 +270,8 @@ static Property vhost_scsi_properties[] = {
DEFINE_PROP_STRING("vhostfd", VirtIOSCSICommon, conf.vhostfd),
DEFINE_PROP_STRING("wwpn", VirtIOSCSICommon, conf.wwpn),
DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
- DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues,
+ VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size,
128),
DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSICommon, conf.seg_max_adjust,