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bh=pa/qQynYZGINjd9y7NjySQLorQMMjExiLlZQH3LPVAk=; b=Y9SjVUSoVsWol8wGhN5r6tLEk17I8/+aCdARh4S5FWJ9KcuyRwXuvO9ULGvtb3zwcptYv+ NvzRCh2ddM401QTDcmfFrcQFMEvp12ilU7kHKdKPCjXvRMOoU/59WkAxVwoAo6lg7lrjs4 1q4GqGKldiRlh9qvNnv40aBLIURx3iQ= X-MC-Unique: ypCzrAdiPACj_Qh2pWhAXQ-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH v4 4/5] virtio-blk: default num_queues to -smp N Date: Wed, 27 May 2020 11:29:24 +0100 Message-Id: <20200527102925.128013-5-stefanha@redhat.com> In-Reply-To: <20200527102925.128013-1-stefanha@redhat.com> References: <20200527102925.128013-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.61; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/27 05:46:19 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Pankaj Gupta , Eduardo Habkost , qemu-block@nongnu.org, "Michael S. Tsirkin" , cohuck@redhat.com, Max Reitz , Stefan Hajnoczi , Paolo Bonzini , Fam Zheng , Raphael Norwitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" 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. Performance improves from 78k to 104k IOPS on a 32 vCPU guest with 101 virtio-blk-pci devices (ioengine=3Dlibaio, iodepth=3D1, bs=3D4k, rw=3Drandr= ead with NVMe storage). Signed-off-by: Stefan Hajnoczi Reviewed-by: Cornelia Huck Reviewed-by: Pankaj Gupta --- include/hw/virtio/virtio-blk.h | 2 ++ hw/block/virtio-blk.c | 6 +++++- hw/core/machine.c | 1 + hw/virtio/virtio-blk-pci.c | 7 ++++++- 4 files changed, 14 insertions(+), 2 deletions(-) diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h index 1e62f869b2..4e5e903f4a 100644 --- a/include/hw/virtio/virtio-blk.h +++ b/include/hw/virtio/virtio-blk.h @@ -30,6 +30,8 @@ struct virtio_blk_inhdr unsigned char status; }; =20 +#define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX + struct VirtIOBlkConf { BlockConf conf; diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index f5f6fc925e..3c36b38255 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -1135,6 +1135,9 @@ static void virtio_blk_device_realize(DeviceState *de= v, Error **errp) error_setg(errp, "Device needs media, but drive is empty"); return; } + if (conf->num_queues =3D=3D VIRTIO_BLK_AUTO_NUM_QUEUES) { + conf->num_queues =3D 1; + } if (!conf->num_queues) { error_setg(errp, "num-queues property must be larger than 0"); return; @@ -1274,7 +1277,8 @@ static Property virtio_blk_properties[] =3D { #endif DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, = 0, true), - DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, 1), + DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, + VIRTIO_BLK_AUTO_NUM_QUEUES), DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256), DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, t= rue), DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD, diff --git a/hw/core/machine.c b/hw/core/machine.c index df7664bc8d..4aba3bdd3c 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -29,6 +29,7 @@ #include "migration/vmstate.h" =20 GlobalProperty hw_compat_5_0[] =3D { + { "virtio-blk-device", "num-queues", "1"}, { "virtio-scsi-device", "num_queues", "1"}, { "vhost-scsi", "num_queues", "1"}, { "vhost-user-scsi", "num_queues", "1"}, diff --git a/hw/virtio/virtio-blk-pci.c b/hw/virtio/virtio-blk-pci.c index 28838fa958..2f0ede3863 100644 --- a/hw/virtio/virtio-blk-pci.c +++ b/hw/virtio/virtio-blk-pci.c @@ -50,9 +50,14 @@ static void virtio_blk_pci_realize(VirtIOPCIProxy *vpci_= dev, Error **errp) { VirtIOBlkPCI *dev =3D VIRTIO_BLK_PCI(vpci_dev); DeviceState *vdev =3D DEVICE(&dev->vdev); + VirtIOBlkConf *conf =3D &dev->vdev.conf; + + if (conf->num_queues =3D=3D VIRTIO_BLK_AUTO_NUM_QUEUES) { + conf->num_queues =3D virtio_pci_optimal_num_queues(0); + } =20 if (vpci_dev->nvectors =3D=3D DEV_NVECTORS_UNSPECIFIED) { - vpci_dev->nvectors =3D dev->vdev.conf.num_queues + 1; + vpci_dev->nvectors =3D conf->num_queues + 1; } =20 qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus)); --=20 2.25.4