Bug 2214884

Summary:	query-stats QMP command interrupts vcpus, the Max Latencies could be more than 100us
Product:	Red Hat Enterprise Linux 9	Reporter:	Gu Nini <ngu>
Component:	qemu-kvm	Assignee:	Marcelo Tosatti <mtosatti>
qemu-kvm sub component:	General	QA Contact:	Gu Nini <ngu>
Status:	CLOSED DUPLICATE	Docs Contact:
Severity:	high
Priority:	high	CC:	alougovs, chayang, coli, jinzhao, junzhao, juzhang, lijin, mrezanin, mtosatti, pezhang, virt-maint, ymankad
Version:	9.2	Keywords:	CustomerScenariosInitiative
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	2218644 (view as bug list)		Environment:
Last Closed:	2023-07-03 07:25:33 UTC	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:
Bug Blocks:	2218644

Description Gu Nini 2023-06-14 03:12:38 UTC

Description of problem:
Under ocp4.13/ocp-v 4.13.1-188 env, the real time worker node is installed with RHCOS based on RHEL9.2, it's found "# Max Latencies: 00090 00096 00141" when run 1 hour cyclictest, while a maximum of 50us is acceptable. From Marcelo, it's caused by "query-stats QMP command interrupts vcpus.", "[PATCH] kvm: reuse per-vcpu stats fd to avoid vcpu interruption" was submitted.

Version-Release number of selected component (if applicable):
Host kernel: Scratch kernel 5.14.0-284.13.1.rt14.298kvmrtv1.el9_2.x86_64 
Guest kernel: Scratch kernel 5.14.0-284.13.1.rt14.298kvmrtv1.el9_2.x86_64
Qemu: qemu-kvm-core-7.2.0-14.el9_2.x86_64

How reproducible:
100%

Steps to Reproduce:
1. 
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Actual results:

Expected results:

Additional info:

Comment 3 Miroslav Rezanina 2023-07-03 07:25:33 UTC

Closing this BZ as clone was approved (9.3.0)  and will be used for z-stream cloning.

*** This bug has been marked as a duplicate of bug 2218644 ***