Bug 2007572
| Summary: | RHOSP16.1: TX queue size is not propagated to guest VM for "vhost" interface type | ||
|---|---|---|---|
| Product: | Red Hat OpenStack | Reporter: | Shravan Kumar Tiwari <shtiwari> |
| Component: | openstack-nova | Assignee: | OSP DFG:Compute <osp-dfg-compute> |
| Status: | CLOSED NOTABUG | QA Contact: | OSP DFG:Compute <osp-dfg-compute> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 16.1 (Train) | CC: | alifshit, dasmith, eglynn, jhakimra, kchamart, sbauza, sgordon, smooney, vromanso |
| Target Milestone: | --- | Keywords: | FutureFeature, Reopened, Triaged |
| 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: | 2022-10-04 21:06:23 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: | |
| Embargoed: | |||
| Bug Depends On: | 2040509 | ||
| Bug Blocks: | |||
DFG:Compute will review the requested support exception on October 28th. Since the RFE has been filed for `tuned`, closing this as a duplicate of the tuned RFE. *** This bug has been marked as a duplicate of bug 2015044 *** Re-opening since we might have to convert this into an RFE for tx_queue_length in OSP 18. Summary from bug-triage call: - Firstly, libvirt's documentation is very clear that QEMU only supports setting up `rx_queue_size` for interface type "vhostuser". However the user here was using interface type "vhost". So, Nova (and libvirt) ignoring "rx_queue_size" for "vhost" is expected behaviour. - Given the above, *if* there is a valid use-case to have "rx_queue_size" support for interface type "vhost", then the first step here is to have the support for it in QEMU. [TODO] So please file a QEMU RFE needs to be filed first, with a clear mention of the use-case. (In reply to Kashyap Chamarthy from comment #16) > Summary from bug-triage call: > > > - Firstly, libvirt's documentation is very clear that QEMU only supports > setting up `rx_queue_size` for interface type "vhostuser". However > the user here was using interface type "vhost". So, Nova (and > libvirt) ignoring "rx_queue_size" for "vhost" is expected behaviour. > > - Given the above, *if* there is a valid use-case to have > "rx_queue_size" support for interface type "vhost", then the first > step here is to have the support for it in QEMU. > > [TODO] So please file a QEMU RFE needs to be filed first, with a > clear mention of the use-case. Err, a bad typo. I mean "tx_queue_size" (not "rx_queue_size") in the entire comment above. (In reply to Kashyap Chamarthy from comment #17) > (In reply to Kashyap Chamarthy from comment #16) > > Summary from bug-triage call: > > > > > > - Firstly, libvirt's documentation is very clear that QEMU only supports > > setting up `rx_queue_size` for interface type "vhostuser". However > > the user here was using interface type "vhost". So, Nova (and > > libvirt) ignoring "rx_queue_size" for "vhost" is expected behaviour. > > > > - Given the above, *if* there is a valid use-case to have > > "rx_queue_size" support for interface type "vhost", then the first > > step here is to have the support for it in QEMU. > > > > [TODO] So please file a QEMU RFE needs to be filed first, with a > > clear mention of the use-case. > > > Err, a bad typo. I mean "tx_queue_size" (not "rx_queue_size") in the > entire comment above. Shravan? Can you please remind us if you've filed the QEMU RFE here? Let's close this for now pending the QEMU work. If/when that gets completed, we can reopen this RFE, or file a new one to enable the qemu support in Nova. |
Description of problem: - RX and TX queue size are configured on director templates NovaLibvirtRxQueueSize: 1024 NovaLibvirtTxQueueSize: 1024 - this is also correctly set in nova.conf tx_queue_size=1024 rx_queue_size=1024 - however the libvirt domain XML only has RX settings [shtiwari@supportshell virsh]$ grep -e queue -e UUID virsh_-r_dumpxml_instance-00000e74 <driver name='vhost' queues='2' rx_queue_size='1024'/> Instance UUID is: virsh_-r_dominfo_instance-00000e74:UUID: 2f9201e3-df6a-4099-9277-4101db156d10 Version-Release number of selected component (if applicable): RHOSP16.1 Actual results: tx_queue_size is not present in libvirt xml created for guest VM during server creation and hence not propagated to guest VM. only rx_queue_size is propagated. Expected results: tx_queue_size should also be updated and propagated to guest VM with the value configured and present in nova.conf. Additional info: