Bug 1495456
| Summary: | Update downstream qemu's max supported cpus for pseries to the RHEL supported number | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Min Deng <mdeng> |
| Component: | qemu-kvm-rhev | Assignee: | David Gibson <dgibson> |
| Status: | CLOSED ERRATA | QA Contact: | Xujun Ma <xuma> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.4-Alt | CC: | bugproxy, hannsj_uhl, knoel, lmiksik, michen, qzhang, rbalakri, virt-maint, xuma |
| Target Milestone: | rc | Keywords: | Patch |
| Target Release: | 7.5-Alt | ||
| Hardware: | ppc64le | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-rhev-2.10.0-11.el7 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-04-11 00:36:03 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: | |||
| Bug Blocks: | 1476742, 1510741, 1518048, 1518049 | ||
|
Description
Min Deng
2017-09-26 05:45:04 UTC
Essentially cosmetic, postponing to RHEL7.5. Brewed a qemu with the correct value at: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=14661947 Still need to fix up the KVM side. ------- Comment From sthoufee.com 2017-12-01 05:17 EDT------- I had found the area of code failure. Will post the patch soon.. So with the patch , when boot up with it would expected to show the below message qemu-system-ppc64: Invalid SMP CPUs 102464. The max CPUs supported by machine 'pseries-rhel7.4.0alt' is 240 oops ... the previous comment has to read: " I had found the area of code failure. Will post the patch soon.. So with the patch , when boot up with "-smp 64,maxcpus=102464,cores=8,threads=1,sockets=8 " qemu-kvm: Number of SMP CPUs requested (102464) exceeds max CPUs supported by machine 'pseries-rhel7.4.0alt' (1024) it would expected to show the below message qemu-system-ppc64: Invalid SMP CPUs 102464. The max CPUs supported by machine 'pseries-rhel7.4.0alt' is 240 " ... ------- Comment From sthoufee.com 2017-12-01 06:27 EDT------- Patch posted for review. Awaiting response. Downstream only fix posted. As noted in the notes for that patch, using the maximum number of vcpus (384) requires threads=2 or greater. Min, can you file a different bug to track the case of -smp 384,threads=1 For reference, the increase to 384 vCPUs on x86 was added via Bug 1433956. Fix included in qemu-kvm-rhev-2.10.0-11.el7 Reproduce the issue on old version: Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.10.0-10.el7.ppc64le Steps to Reproduce: 1.boot up with "-smp 64,maxcpus=102464,cores=8,threads=1,sockets=8 " qemu-kvm: Invalid SMP CPUs 102464. The max CPUs supported by machine 'pseries-rhel7.5.0' is 1024 2.according to the above message "-smp 64,maxcpus=1024,cores=8,threads=1,sockets=128" Warning: Number of hotpluggable cpus requested (1024) exceeds the recommended cpus supported by KVM (144) Number of hotpluggable cpus requested (1024) exceeds the maximum cpus supported by KVM (240) Verified the issue on the latest build: Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.10.0-11.el7.ppc64le Steps to Reproduce: 1.The same steps as above Actual results: 1.qemu-kvm: Invalid SMP CPUs 102464. The max CPUs supported by machine 'pseries-rhel7.5.0' is 384 2.qemu-kvm: Invalid SMP CPUs 1024. The max CPUs supported by machine 'pseries-rhel7.5.0' is 384 Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2018:1104 |