Bug 1465456
| Summary: | Hot-plugged SCSI-Virtio disk does not receive controlled with correct IO thread | ||||||
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| Product: | [oVirt] ovirt-engine | Reporter: | Artyom <alukiano> | ||||
| Component: | BLL.Virt | Assignee: | Michal Skrivanek <michal.skrivanek> | ||||
| Status: | CLOSED WONTFIX | QA Contact: | meital avital <mavital> | ||||
| Severity: | low | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 4.1.3.2 | CC: | amureini, bugs, derez, tjelinek, tnisan | ||||
| Target Milestone: | --- | Flags: | sbonazzo:
ovirt-4.3-
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| Target Release: | --- | ||||||
| Hardware: | x86_64 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2017-06-28 06:38:13 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | Virt | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Attachments: |
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Versions: rhevm-4.1.3.2-0.1.el7.noarch vdsm-4.19.19-1.el7ev.x86_64 doesn't sound like an interesting use case. We do a simple round robin....when ou start doing hot plugs it's no longer simple. On top of that - performance improvements for more iothreads seem to be negligent. WONTFIX? (In reply to Michal Skrivanek from comment #2) > doesn't sound like an interesting use case. We do a simple round > robin....when ou start doing hot plugs it's no longer simple. > On top of that - performance improvements for more iothreads seem to be > negligent. > WONTFIX? Yes. |
Created attachment 1292330 [details] engine and vdsm log Description of problem: Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Create VM with one SCSI-Virtio disk and 2 IO threads 2. Start the VM <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source startupPolicy='optional'/> <backingStore/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <disk type='file' device='disk' snapshot='no'> <driver name='qemu' type='raw' cache='none' error_policy='stop' io='threads'/> <source file='/rhev/data-center/00000001-0001-0001-0001-000000000311/02ee81e8-c25b-4882-9324-a78793ece745/images/1c453cc3-6e02-4598-bfa6-082bd364daef/3bd1b7d5-cfad-429e-beec-e7e5a8edce60'/> <backingStore/> <target dev='sda' bus='scsi'/> <serial>1c453cc3-6e02-4598-bfa6-082bd364daef</serial> <boot order='1'/> <alias name='scsi0-0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <controller type='usb' index='0' model='piix3-uhci'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='scsi' index='0' model='virtio-scsi'> <driver iothread='1'/> <alias name='scsi0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </controller> <controller type='scsi' index='1' model='virtio-scsi'> <driver iothread='2'/> <alias name='scsi1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </controller> ... 3. Hotplug additional SCSI-Virtio disk to VM <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source startupPolicy='optional'/> <backingStore/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <disk type='file' device='disk' snapshot='no'> <driver name='qemu' type='raw' cache='none' error_policy='stop' io='threads'/> <source file='/rhev/data-center/00000001-0001-0001-0001-000000000311/02ee81e8-c25b-4882-9324-a78793ece745/images/1c453cc3-6e02-4598-bfa6-082bd364daef/3bd1b7d5-cfad-429e-beec-e7e5a8edce60'/> <backingStore/> <target dev='sda' bus='scsi'/> <serial>1c453cc3-6e02-4598-bfa6-082bd364daef</serial> <boot order='1'/> <alias name='scsi0-0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='disk' snapshot='no'> <driver name='qemu' type='raw' cache='none' error_policy='stop' io='threads'/> <source file='/rhev/data-center/00000001-0001-0001-0001-000000000311/02ee81e8-c25b-4882-9324-a78793ece745/images/85465f18-159f-4e69-bda0-0fe9b768a12b/a8ac4c4f-700f-4943-bb56-2320db71a3e3'/> <backingStore/> <target dev='sdb' bus='scsi'/> <serial>85465f18-159f-4e69-bda0-0fe9b768a12b</serial> <alias name='scsi0-0-0-2'/> <address type='drive' controller='0' bus='0' target='0' unit='2'/> </disk> <controller type='usb' index='0' model='piix3-uhci'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='scsi' index='0' model='virtio-scsi'> <driver iothread='1'/> <alias name='scsi0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </controller> <controller type='scsi' index='1' model='virtio-scsi'> <driver iothread='2'/> <alias name='scsi1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </controller> ... Actual results: Hot-plugged disk has controller with the same IO thread as the first disk Expected results: Hot-plugged disk must have controller with different IO thread(sure I talk only about cases when number_of_iothreads > number of disks) Additional info: