From: Mike Christie <michael.christie@oracle.com> To: stefanha@redhat.com, qemu-devel@nongnu.org, fam@euphon.net, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, mst@redhat.com, jasowang@redhat.com, pbonzini@redhat.com, virtualization@lists.linux-foundation.org Subject: [PATCH 00/10] vhost/qemu: thread per IO SCSI vq Date: Thu, 12 Nov 2020 23:18:59 +0000 [thread overview] Message-ID: <1605223150-10888-1-git-send-email-michael.christie@oracle.com> (raw) The following kernel patches were made over Michael's vhost branch: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/log/?h=vhost and the vhost-scsi bug fix patchset: https://lore.kernel.org/linux-scsi/20201112170008.GB1555653@stefanha-x1.localdomain/T/#t And the qemu patch was made over the qemu master branch. vhost-scsi currently supports multiple queues with the num_queues setting, but we end up with a setup where the guest's scsi/block layer can do a queue per vCPU and the layers below vhost can do a queue per CPU. vhost-scsi will then do a num_queue virtqueues, but all IO gets set on and completed on a single vhost-scsi thread. After 2 - 4 vqs this becomes a bottleneck. This patchset allows us to create a worker thread per IO vq, so we can better utilize multiple CPUs with the multiple queues. It implments Jason's suggestion to create the initial worker like normal, then create the extra workers for IO vqs with the VHOST_SET_VRING_ENABLE ioctl command added in this patchset.
WARNING: multiple messages have this Message-ID (diff)
From: Mike Christie <michael.christie@oracle.com> To: stefanha@redhat.com, qemu-devel@nongnu.org, fam@euphon.net, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, mst@redhat.com, jasowang@redhat.com, pbonzini@redhat.com, virtualization@lists.linux-foundation.org Subject: [PATCH 00/10] vhost/qemu: thread per IO SCSI vq Date: Thu, 12 Nov 2020 17:18:59 -0600 [thread overview] Message-ID: <1605223150-10888-1-git-send-email-michael.christie@oracle.com> (raw) The following kernel patches were made over Michael's vhost branch: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/log/?h=vhost and the vhost-scsi bug fix patchset: https://lore.kernel.org/linux-scsi/20201112170008.GB1555653@stefanha-x1.localdomain/T/#t And the qemu patch was made over the qemu master branch. vhost-scsi currently supports multiple queues with the num_queues setting, but we end up with a setup where the guest's scsi/block layer can do a queue per vCPU and the layers below vhost can do a queue per CPU. vhost-scsi will then do a num_queue virtqueues, but all IO gets set on and completed on a single vhost-scsi thread. After 2 - 4 vqs this becomes a bottleneck. This patchset allows us to create a worker thread per IO vq, so we can better utilize multiple CPUs with the multiple queues. It implments Jason's suggestion to create the initial worker like normal, then create the extra workers for IO vqs with the VHOST_SET_VRING_ENABLE ioctl command added in this patchset.
next reply other threads:[~2020-11-12 23:18 UTC|newest] Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-12 23:18 Mike Christie [this message] 2020-11-12 23:18 ` [PATCH 00/10] vhost/qemu: thread per IO SCSI vq Mike Christie 2020-11-12 23:19 ` [PATCH 1/1] qemu vhost scsi: add VHOST_SET_VRING_ENABLE support Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 11:53 ` Stefan Hajnoczi 2020-11-17 11:53 ` Stefan Hajnoczi 2020-11-17 11:53 ` Stefan Hajnoczi 2020-12-02 9:59 ` Michael S. Tsirkin 2020-12-02 9:59 ` Michael S. Tsirkin 2020-12-02 9:59 ` Michael S. Tsirkin 2020-12-02 16:05 ` Michael Christie 2020-12-02 16:05 ` Michael Christie 2020-11-12 23:19 ` [PATCH 01/10] vhost: remove work arg from vhost_work_flush Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 13:04 ` Stefan Hajnoczi 2020-11-17 13:04 ` Stefan Hajnoczi 2020-11-17 13:04 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 02/10] vhost scsi: remove extra flushes Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 13:07 ` Stefan Hajnoczi 2020-11-17 13:07 ` Stefan Hajnoczi 2020-11-17 13:07 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 03/10] vhost poll: fix coding style Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 13:07 ` Stefan Hajnoczi 2020-11-17 13:07 ` Stefan Hajnoczi 2020-11-17 13:07 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 04/10] vhost: support multiple worker threads Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-12 23:19 ` [PATCH 05/10] vhost: poll support support multiple workers Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 15:32 ` Stefan Hajnoczi 2020-11-17 15:32 ` Stefan Hajnoczi 2020-11-17 15:32 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 06/10] vhost scsi: make SCSI cmd completion per vq Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 16:04 ` Stefan Hajnoczi 2020-11-17 16:04 ` Stefan Hajnoczi 2020-11-17 16:04 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 07/10] vhost, vhost-scsi: flush IO vqs then send TMF rsp Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 16:05 ` Stefan Hajnoczi 2020-11-17 16:05 ` Stefan Hajnoczi 2020-11-17 16:05 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 08/10] vhost: move msg_handler to new ops struct Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 16:08 ` Stefan Hajnoczi 2020-11-17 16:08 ` Stefan Hajnoczi 2020-11-17 16:08 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 09/10] vhost: add VHOST_SET_VRING_ENABLE support Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 16:14 ` Stefan Hajnoczi 2020-11-17 16:14 ` Stefan Hajnoczi 2020-11-17 16:14 ` Stefan Hajnoczi 2020-11-12 23:19 ` [PATCH 10/10] vhost-scsi: create a woker per IO vq Mike Christie 2020-11-12 23:19 ` Mike Christie 2020-11-17 16:40 ` [PATCH 00/10] vhost/qemu: thread per IO SCSI vq Stefan Hajnoczi 2020-11-17 16:40 ` Stefan Hajnoczi 2020-11-17 16:40 ` Stefan Hajnoczi 2020-11-17 19:13 ` Mike Christie 2020-11-17 19:13 ` Mike Christie 2020-11-18 9:54 ` Michael S. Tsirkin 2020-11-18 9:54 ` Michael S. Tsirkin 2020-11-18 9:54 ` Michael S. Tsirkin 2020-11-19 14:00 ` Stefan Hajnoczi 2020-11-19 14:00 ` Stefan Hajnoczi 2020-11-19 14:00 ` Stefan Hajnoczi 2020-11-18 11:31 ` Stefan Hajnoczi 2020-11-18 11:31 ` Stefan Hajnoczi 2020-11-18 11:31 ` Stefan Hajnoczi 2020-11-19 14:46 ` Michael S. Tsirkin 2020-11-19 14:46 ` Michael S. Tsirkin 2020-11-19 14:46 ` Michael S. Tsirkin 2020-11-19 16:11 ` Mike Christie 2020-11-19 16:11 ` Mike Christie 2020-11-19 16:24 ` Stefan Hajnoczi 2020-11-19 16:24 ` Stefan Hajnoczi 2020-11-19 16:24 ` Stefan Hajnoczi 2020-11-19 16:43 ` Mike Christie 2020-11-19 16:43 ` Mike Christie 2020-11-19 17:08 ` Stefan Hajnoczi 2020-11-19 17:08 ` Stefan Hajnoczi 2020-11-19 17:08 ` Stefan Hajnoczi 2020-11-20 8:45 ` Stefan Hajnoczi 2020-11-20 8:45 ` Stefan Hajnoczi 2020-11-20 8:45 ` Stefan Hajnoczi 2020-11-20 12:31 ` Michael S. Tsirkin 2020-11-20 12:31 ` Michael S. Tsirkin 2020-11-20 12:31 ` Michael S. Tsirkin 2020-12-01 12:59 ` Stefan Hajnoczi 2020-12-01 12:59 ` Stefan Hajnoczi 2020-12-01 12:59 ` Stefan Hajnoczi 2020-12-01 13:45 ` Stefano Garzarella 2020-12-01 13:45 ` Stefano Garzarella 2020-12-01 13:45 ` Stefano Garzarella 2020-12-01 17:43 ` Stefan Hajnoczi 2020-12-01 17:43 ` Stefan Hajnoczi 2020-12-01 17:43 ` Stefan Hajnoczi 2020-12-02 10:35 ` Stefano Garzarella 2020-12-02 10:35 ` Stefano Garzarella 2020-12-02 10:35 ` Stefano Garzarella 2020-11-23 15:17 ` Stefano Garzarella 2020-11-23 15:17 ` Stefano Garzarella 2020-11-23 15:17 ` Stefano Garzarella 2020-11-18 5:17 ` Jason Wang 2020-11-18 5:17 ` Jason Wang 2020-11-18 6:57 ` Mike Christie 2020-11-18 7:19 ` Mike Christie 2020-11-18 7:54 ` Jason Wang 2020-11-18 7:54 ` Jason Wang 2020-11-18 20:06 ` Mike Christie 2020-11-19 4:35 ` Jason Wang 2020-11-19 4:35 ` Jason Wang 2020-11-19 15:49 ` Mike Christie
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