diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2020-08-18 15:33:46 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-08-27 08:29:13 -0400 |
| commit | 6a558822849fab604a1fcb71e7c4e528cafa21d9 (patch) | |
| tree | baeec7fcfa10f0b0ff3a3290c614453adc0f5e02 /include/hw/virtio | |
| parent | 4e5163bd844429711b4d60d51030ab83048d80cd (diff) | |
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 'include/hw/virtio')
| -rw-r--r-- | include/hw/virtio/virtio-scsi.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h index 9f293bcb80..c0b8e4dd7e 100644 --- a/include/hw/virtio/virtio-scsi.h +++ b/include/hw/virtio/virtio-scsi.h @@ -39,6 +39,8 @@ /* Number of virtqueues that are always present */ #define VIRTIO_SCSI_VQ_NUM_FIXED 2 +#define VIRTIO_SCSI_AUTO_NUM_QUEUES UINT32_MAX + typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq; typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp; typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq; |