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9445e1e15e
qemu/hw/virtio
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Stefan Hajnoczi 9445e1e15e virtio-blk-pci: default num_queues to -smp N 
Automatically size the number of virtio-blk-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.

Performance improves from 78k to 104k IOPS on a 32 vCPU guest with 101
virtio-blk-pci devices (ioengine=libaio, iodepth=1, bs=4k, rw=randread
with NVMe storage).

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Message-Id: <20200818143348.310613-7-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2020-08-27 08:29:13 -04:00
..
Kconfig virtio-mem: Paravirtualized memory hot(un)plug 2020-07-03 07:57:04 -04:00
meson.build meson: convert hw/virtio 2020-08-21 06:30:26 -04:00
trace-events virtio,acpi: features, fixes, cleanups. 2020-07-07 17:37:44 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vhost-backend.c vhost-vdpa: introduce vhost-vdpa backend 2020-07-07 07:59:51 -04:00
vhost-scsi-pci.c virtio-scsi-pci: default num_queues to -smp N 2020-08-27 08:29:13 -04:00
vhost-stub.c vhost-user: simplify vhost_user_init/vhost_user_cleanup 2019-03-12 21:22:31 -04:00
vhost-user-blk-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
vhost-user-fs-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
vhost-user-fs.c qdev: Unrealize must not fail 2020-05-15 07:08:14 +02:00
vhost-user-input-pci.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
vhost-user-scsi-pci.c virtio-scsi-pci: default num_queues to -smp N 2020-08-27 08:29:13 -04:00
vhost-user-vsock-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
vhost-user-vsock.c virtio: add vhost-user-vsock base device 2020-06-12 10:17:06 -04:00
vhost-user.c Fix vhost-user buffer over-read on ram hot-unplug 2020-07-27 10:28:28 -04:00
vhost-vdpa.c vhost-vdpa :Fix Coverity CID 1430270 / CID 1420267 2020-07-27 10:28:28 -04:00
vhost-vsock-common.c vhost-vsock: add vhost-vsock-common abstraction 2020-06-12 10:17:06 -04:00
vhost-vsock-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
vhost-vsock.c vhost-vsock: add vhost-vsock-common abstraction 2020-06-12 10:17:06 -04:00
vhost.c vhost: implement vhost_force_iommu method 2020-07-03 07:57:04 -04:00
virtio-9p-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
virtio-balloon-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
virtio-balloon.c virtio-balloon: Replace free page hinting references to 'report' with 'hint' 2020-07-22 07:57:07 -04:00
virtio-blk-pci.c virtio-blk-pci: default num_queues to -smp N 2020-08-27 08:29:13 -04:00
virtio-bus.c virtio: notify virtqueue via host notifier when available 2019-11-06 06:35:00 -05:00
virtio-crypto-pci.c virtio: Drop broken and superfluous object_property_set_link() 2020-07-22 07:57:07 -04:00
virtio-crypto.c qom: Change object_get_canonical_path_component() not to malloc 2020-07-21 16:23:43 +02:00
virtio-input-host-pci.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
virtio-input-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
virtio-iommu-pci.c qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
virtio-iommu.c virtio-iommu: Fix coverity issue in virtio_iommu_handle_command() 2020-07-13 14:36:08 +01:00
virtio-mem-pci.c virtio-mem-pci: force virtio version 1 2020-07-27 09:38:33 -04:00
virtio-mem-pci.h virtio-pci: Send qapi events when the virtio-mem size changes 2020-07-03 07:57:04 -04:00
virtio-mem.c meson: infrastructure for building emulators 2020-08-21 06:30:17 -04:00
virtio-mmio.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-net-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
virtio-pci.c virtio-pci: add virtio_pci_optimal_num_queues() helper 2020-08-27 08:29:13 -04:00
virtio-pci.h virtio-pci: add virtio_pci_optimal_num_queues() helper 2020-08-27 08:29:13 -04:00
virtio-pmem-pci.c qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
virtio-pmem-pci.h virtio-pci: Proxy for virtio-pmem 2019-07-04 17:00:32 -04:00
virtio-pmem.c qom: Change object_get_canonical_path_component() not to malloc 2020-07-21 16:23:43 +02:00
virtio-rng-pci.c virtio: Drop broken and superfluous object_property_set_link() 2020-07-22 07:57:07 -04:00
virtio-rng.c error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
virtio-scsi-pci.c virtio-scsi-pci: default num_queues to -smp N 2020-08-27 08:29:13 -04:00
virtio-serial-pci.c qdev: Convert uses of qdev_set_parent_bus() with Coccinelle 2020-06-15 22:05:08 +02:00
virtio.c virtio-pci: fix virtio_pci_queue_enabled() 2020-07-27 11:34:50 -04:00