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Bug 2157984 - [libvirt] RFE: Per-virtqueue IOThread assignment for virtio-blk and virtio-scsi
Summary: [libvirt] RFE: Per-virtqueue IOThread assignment for virtio-blk and virtio-scsi
Keywords:
Status: CLOSED MIGRATED
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: libvirt
Version: 9.3
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Peter Krempa
QA Contact: Han Han
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-01-03 20:16 UTC by Stefan Hajnoczi
Modified: 2023-09-22 16:55 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-09-22 16:55:57 UTC
Type: Story
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

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System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker   RHEL-7416 0 None Migrated None 2023-09-22 16:55:54 UTC
Red Hat Issue Tracker RHELPLAN-143572 0 None None None 2023-01-03 20:26:12 UTC

Description Stefan Hajnoczi 2023-01-03 20:16:00 UTC 
Work is underway to add per-virtqueue IOThread mapping to QEMU's virtio-blk and virtio-scsi devices.

Currently each device instance can be associated with just one IOThread where all virtqueues are processed. This is known to be a bottleneck and prevents true multi-queue operation because all I/O requests are funneled through a single IOThread on the host.

The new multi-queue support in QEMU will allow individual virtqueues to be mapped to an IOThread. It is likely that most users will wish to spread virtqueues round-robin across a set of IOThreads.

New domain XML syntax is necessary to expose this feature once it becomes available in QEMU.

I am filing this BZ now so there is time to discuss the feature and so that libvirt support can be developed in parallel to QEMU.
Comment 2 Vivek Goyal 2023-01-03 21:10:22 UTC 
I guess one question I have is how the qemu and libvirt syntax going to look like to configure this feature.
Comment 3 Stefan Hajnoczi 2023-01-18 19:54:19 UTC 
I have posted a QEMU RFC patch series:
https://lore.kernel.org/qemu-devel/20230118194732.1258208-1-stefanha@redhat.com/T/#t

Please see this patch series for proposed libvirt domain XML and the QEMU command-line syntax.
Comment 4 Peter Krempa 2023-03-06 13:49:37 UTC 
RFC patches for libvirt which build upon the proposed qemu syntax are part of the following series addressing multiple iothread features:

https://listman.redhat.com/archives/libvir-list/2023-March/238250.html
Comment 6 RHEL Program Management 2023-09-22 16:54:55 UTC 
Issue migration from Bugzilla to Jira is in process at this time. This will be the last message in Jira copied from the Bugzilla bug.
Comment 7 RHEL Program Management 2023-09-22 16:55:57 UTC 
This BZ has been automatically migrated to the issues.redhat.com Red Hat Issue Tracker. All future work related to this report will be managed there.

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