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, jshortt, ltao, mburns, mleitner, ralonsoh, rrubins, ruyang, smooney, vcandapp |
Target Milestone: | --- | Keywords: | Triaged |
Target Release: | --- | ||
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.
+
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.
|
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: |
Description
Robin Jarry
2023-07-05 14:52:06 UTC
|