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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2020-08-18 15:33:47 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-08-27 08:29:13 -0400 |
| commit | 9445e1e15e66c19e42bea942ba810db28052cd05 (patch) | |
| tree | 04f90ede63d0f327c660fefbbc45f04c610ec429 /hw/virtio/vhost-user-blk-pci.c | |
| parent | 6a558822849fab604a1fcb71e7c4e528cafa21d9 (diff) | |
| download | focaccia-qemu-9445e1e15e66c19e42bea942ba810db28052cd05.tar.gz focaccia-qemu-9445e1e15e66c19e42bea942ba810db28052cd05.zip | |
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>
Diffstat (limited to 'hw/virtio/vhost-user-blk-pci.c')
0 files changed, 0 insertions, 0 deletions