diff options
| author | Stefan Hajnoczi | 2020-08-18 16:33:46 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin | 2020-08-27 14:29:13 +0200 |
| commit | 6a558822849fab604a1fcb71e7c4e528cafa21d9 (patch) | |
| tree | baeec7fcfa10f0b0ff3a3290c614453adc0f5e02 /hw/scsi/vhost-scsi.c | |
| parent | virtio-scsi: introduce a constant for fixed virtqueues (diff) | |
| download | qemu-6a558822849fab604a1fcb71e7c4e528cafa21d9.tar.gz qemu-6a558822849fab604a1fcb71e7c4e528cafa21d9.tar.xz qemu-6a558822849fab604a1fcb71e7c4e528cafa21d9.zip | |
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.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c index 13b05af29b..a83ffeefc8 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, |