Bug 1878579
Summary: | cyclictest max latency is close to threshold 40us in rhel8.2.z kvm-rt testing with OSP16.1 | ||
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Product: | Red Hat Enterprise Linux 8 | Reporter: | Pei Zhang <pezhang> |
Component: | kernel-rt | Assignee: | Nitesh Narayan Lal <nilal> |
kernel-rt sub component: | KVM | QA Contact: | Pei Zhang <pezhang> |
Status: | CLOSED CURRENTRELEASE | Docs Contact: | |
Severity: | low | ||
Priority: | low | CC: | bhu, chayang, jinzhao, juzhang, lcapitulino, nilal, qzhao, virt-maint, williams |
Version: | 8.2 | ||
Target Milestone: | rc | ||
Target Release: | 8.0 | ||
Hardware: | Unspecified | ||
OS: | Unspecified | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | If docs needed, set a value | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2020-11-05 12:36:08 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: |
Description
Pei Zhang
2020-09-14 03:05:40 UTC
Pei, Once you test the latest 8.2.z kernel with OSP and get decent max latency values. Maybe we can close this bug? I am hopeful that we will get better values because you are getting good results (24us) with a non-OSP setup. Thanks (In reply to Nitesh Narayan Lal from comment #11) > Pei, > > Once you test the latest 8.2.z kernel with OSP and get decent max latency > values. > Maybe we can close this bug? > > I am hopeful that we will get better values because you are getting good > results (24us) with a non-OSP setup. > > Thanks Nitesh, The latest testing results look good. With osp 16.1, 12h oslat testing max latency is 9us,12h cyclictest max latency is 31us. ==12h oslat results== (1)Single VM with 1 rt vCPU: Max Latency: 8 (us) (2)Single VM with 8 rt vCPUs: Max Latency: 9 7 7 8 7 9 7 8 (us) (3)Multiple VMs each with 1 rt vCPU: - VM1 Max Latency: 9 (us) - VM2 Max Latency: 9 (us) - VM3 Max Latency: 8 (us) - VM4 Max Latency: 9 (us) ==12h cyclictest results== (1)Single VM with 1 rt vCPU: # Min Latencies: 00007 # Avg Latencies: 00009 # Max Latencies: 00021 (2)Single VM with 8 rt vCPUs: # Min Latencies: 00008 00013 00013 00013 00013 00012 00013 00013 # Avg Latencies: 00009 00013 00013 00013 00013 00013 00013 00013 # Max Latencies: 00025 00021 00024 00024 00021 00031 00024 00024 (3)Multiple VMs each with 1 rt vCPU: - VM1 # Min Latencies: 00007 # Avg Latencies: 00009 # Max Latencies: 00020 - VM2 # Min Latencies: 00007 # Avg Latencies: 00009 # Max Latencies: 00021 - VM3 # Min Latencies: 00007 # Avg Latencies: 00009 # Max Latencies: 00021 - VM4 # Min Latencies: 00007 # Avg Latencies: 00011 # Max Latencies: 00024 ==Versions== python3-openstackclient-4.0.1-1.20200817092223.bff556c.el8ost.noarch tag: 16.1_20201020.1 kernel-rt-4.18.0-193.30.1.rt13.79.el8_2.x86_64 qemu-kvm-4.2.0-29.module+el8.2.1+7990+27f1e480.4.x86_64 192.168.24.1:8787/rh-osbs/rhosp16-openstack-nova-libvirt:16.1_20201020.1 tuned-2.13.0-6.el8.noarch rt-tests-1.5-18.el8.x86_64 So close this bug. Thanks, Pei. As we discussed previously over email, I agree with your conclusion. Thanks |