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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2020-08-18 15:33:48 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-08-27 08:29:13 -0400 |
| commit | a4eef0711b2cf7a7476c3e2c202a414b68a1baa0 (patch) | |
| tree | faab55d185ae4aff1ce2d2dd9ba31b2b77ee5722 /hw/block | |
| parent | 9445e1e15e66c19e42bea942ba810db28052cd05 (diff) | |
| download | qemu-a4eef0711b2cf7a7476c3e2c202a414b68a1baa0.zip qemu-a4eef0711b2cf7a7476c3e2c202a414b68a1baa0.tar.gz qemu-a4eef0711b2cf7a7476c3e2c202a414b68a1baa0.tar.bz2 | |
vhost-user-blk-pci: default num_queues to -smp N
Automatically size the number of request virtqueues to match the number
of vCPUs. This 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>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Message-Id: <20200818143348.310613-8-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/block')
| -rw-r--r-- | hw/block/vhost-user-blk.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index a00b854..39aec42 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -420,6 +420,9 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp) return; } + if (s->num_queues == VHOST_USER_BLK_AUTO_NUM_QUEUES) { + s->num_queues = 1; + } if (!s->num_queues || s->num_queues > VIRTIO_QUEUE_MAX) { error_setg(errp, "vhost-user-blk: invalid number of IO queues"); return; @@ -531,7 +534,8 @@ static const VMStateDescription vmstate_vhost_user_blk = { static Property vhost_user_blk_properties[] = { DEFINE_PROP_CHR("chardev", VHostUserBlk, chardev), - DEFINE_PROP_UINT16("num-queues", VHostUserBlk, num_queues, 1), + DEFINE_PROP_UINT16("num-queues", VHostUserBlk, num_queues, + VHOST_USER_BLK_AUTO_NUM_QUEUES), DEFINE_PROP_UINT32("queue-size", VHostUserBlk, queue_size, 128), DEFINE_PROP_BIT("config-wce", VHostUserBlk, config_wce, 0, true), DEFINE_PROP_END_OF_LIST(), |