Bug 2219830
| Summary: | irqbalance: silently failing to enforce IRQBALANCE_BANNED_CPULIST | ||
|---|---|---|---|
| Product: | Red Hat OpenStack | Reporter: | Robin Jarry <rjarry> |
| Component: | openvswitch | Assignee: | Robin Jarry <rjarry> |
| Status: | ASSIGNED --- | QA Contact: | Eran Kuris <ekuris> |
| Severity: | medium | Docs Contact: | |
| Priority: | high | ||
| Version: | 17.1 (Wallaby) | CC: | apevec, atenart, cfontain, chrisw, dmarchan, ekuris, gregraka, hakhande, jdluhos, jeder, jelynch, jshortt, ltao, mleitner, ralonsoh, ruyang, smooney, vcandapp |
| Target Milestone: | z2 | Keywords: | Triaged |
| Target Release: | 17.1 | Flags: | gregraka:
needinfo?
(rjarry) |
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Known Issue | |
| Doc Text: |
In RHOSP 17.1, there is a known issue of transient packet loss where hardware interrupt requests (IRQs) are causing non-voluntary context switches on OVS-DPDK PMD threads or in guests running DPDK applications.
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This issue is the result of provisioning large numbers of VFs during deployment. VFs need IRQs, each of which must be bound to a physical CPU. When there are not enough housekeeping CPUs to handle the capacity of IRQs, `irqbalance` fails to bind all of them and the IRQs overspill on isolated CPUs.
+
Workaround: You can try one or more of these actions:
* Reduce the number of provisioned VFs to avoid unused VFs remaining bound to their default Linux driver.
* Increase the number of housekeeping CPUs to handle all IRQs.
* Force unused VF network interfaces down to avoid IRQs from interrupting isolated CPUs.
* Disable multicast and broadcast traffic on unused, down VF network interfaces to avoid IRQs from interrupting isolated CPUs.
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Story Points: | --- |
| Clone Of: | 2184735 | Environment: | |
| Last Closed: | Type: | --- | |
| 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: | 2184735 | ||
| Bug Blocks: | |||
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Description
Robin Jarry
2023-07-05 14:52:06 UTC
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