Bug 1812652
| Summary: | Disable USB when not required | ||
|---|---|---|---|
| Product: | Red Hat OpenStack | Reporter: | Marcelo Tosatti <mtosatti> |
| Component: | openstack-nova | Assignee: | Stephen Finucane <stephenfin> |
| Status: | CLOSED ERRATA | QA Contact: | James Parker <jparker> |
| Severity: | urgent | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | alifshit, dasmith, egallen, eglynn, jhakimra, jparker, jschluet, kchamart, lcapitulino, nilal, sbauza, sgordon, smooney, stephenfin, vromanso, williams |
| Target Milestone: | beta | Keywords: | Patch, Triaged |
| Target Release: | 17.0 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | openstack-nova-23.2.1-0.20220428212241.327693a.el9ost | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-09-21 12:09:42 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | Wallaby |
| Embargoed: | |||
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Description
Marcelo Tosatti
2020-03-11 18:39:33 UTC
*** Bug 1813007 has been marked as a duplicate of this bug. *** I've started working on this. Currently, on an x86 host, no USB devices will be added unless graphics are enabled. The only devices that nova currently supports where a USB bus may be used are input devices (keyboard, mouse, tablet) and disk devices. If graphics are disabled, no input device will be attached. You can disable graphics at a host-level by setting '[vnc]enabled=False' and '[spice]enabled=False' (note: SPICE is not currently supported in OSP so this should be 'false' by default). However, libvirt will automatically add a USB bus even if there are no USB-based devices. My proposed fix is to explicitly disable the bus in this case. With that fix in place, disabling graphics and ensuring disks use a non-USB bus (this would only happen if you set the 'hw_disk_bus' image metadata property to 'usb'). @Marcelo Tosatti: Does that sound reasonable? I assume graphics are not a desirable feature on real-time instances. (In reply to Stephen Finucane from comment #3) > I've started working on this. Currently, on an x86 host, no USB devices will > be added unless graphics are enabled. The only devices that nova currently > supports where a USB bus may be used are input devices (keyboard, mouse, > tablet) and disk devices. If graphics are disabled, no input device will be > attached. You can disable graphics at a host-level by setting > '[vnc]enabled=False' and '[spice]enabled=False' (note: SPICE is not > currently supported in OSP so this should be 'false' by default). However, > libvirt will automatically add a USB bus even if there are no USB-based > devices. My proposed fix is to explicitly disable the bus in this case. With > that fix in place, disabling graphics and ensuring disks use a non-USB bus > (this would only happen if you set the 'hw_disk_bus' image metadata property > to 'usb'). > > @Marcelo Tosatti: Does that sound reasonable? Yes. > I assume graphics are not a desirable feature on real-time instances. VNC graphics processing can cause latency spikes, as seen by: https://bugzilla.redhat.com/show_bug.cgi?id=1787442#c0 Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Release of components for Red Hat OpenStack Platform 17.0 (Wallaby)), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2022:6543 |