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Bug 2167434

Summary: [RFE] QEMU throttling should be configurable through libvirt
Product: Red Hat Enterprise Linux 9 Reporter: smita.raut
Component: libvirtAssignee: Virtualization Maintenance <virt-maint>
libvirt sub component: Storage QA Contact: Virtualization Bugs <virt-bugs>
Status: CLOSED NOTABUG Docs Contact:
Severity: medium    
Priority: unspecified CC: pkrempa, virt-maint
Version: unspecifiedKeywords: FutureFeature
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2023-02-08 08:04:00 UTC Type: Feature Request
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description smita.raut 2023-02-06 16:07:10 UTC 
Description of problem:
QEMU has a throttling module that can be used to set limits to I/O operations. But the virtualization solutions that are based on libvirt would need this mechanism to be available in libvirt in order to manage throttle groups.

Additional info:
Parameters like "iops-total", "iops-total-max" and "group" should be made available through libvirt.
Comment 2 Peter Krempa 2023-02-08 08:04:00 UTC 
Libvirt allows setting throttling parameters on the disk level via following config:

<devices>
  <disk type='file'>
    [...]
    <source file='/var/lib/libvirt/images/blah.img'/>
    [...]
    <iotune>
      <total_bytes_sec>10000000</total_bytes_sec>
      <read_iops_sec>400000</read_iops_sec>
      <write_iops_sec>100000</write_iops_sec>
    </iotune>

See the documentation for the <iotune> sub-element of https://www.libvirt.org/formatdomain.html#devices for other available trottling parameters including those you've requested.

In case you require a more complex configuration please make sure to raise that with your support representative and include a more detailed description of your use case so that we can evaluate it.