Bug 2028623
| Summary: | [9.0] machine types: 6.2: Fix prefer_sockets | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 9 | Reporter: | Dr. David Alan Gilbert <dgilbert> | |
| Component: | qemu-kvm | Assignee: | Dr. David Alan Gilbert <dgilbert> | |
| qemu-kvm sub component: | Machine Types | QA Contact: | liunana <nanliu> | |
| Status: | CLOSED ERRATA | Docs Contact: | ||
| Severity: | medium | |||
| Priority: | medium | CC: | cohuck, coli, jinzhao, juzhang, mrezanin, nanliu, thuth, virt-maint | |
| Version: | 9.0 | Flags: | pm-rhel:
mirror+
|
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| Target Milestone: | rc | |||
| Target Release: | 9.0 | |||
| Hardware: | x86_64 | |||
| OS: | Linux | |||
| Whiteboard: | ||||
| Fixed In Version: | qemu-kvm-6.2.0-4.el9 | Doc Type: | No Doc Update | |
| Doc Text: | Story Points: | --- | ||
| Clone Of: | ||||
| : | 2029582 (view as bug list) | Environment: | ||
| Last Closed: | 2022-05-17 12:25:10 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: | 2029582 | |||
Fixed in: https://gitlab.com/redhat/rhel/src/qemu-kvm/qemu-kvm/-/merge_requests/85 (on top of rc3 rebase) (In reply to Dr. David Alan Gilbert from comment #1) > Fixed in: > https://gitlab.com/redhat/rhel/src/qemu-kvm/qemu-kvm/-/merge_requests/85 > (on top of rc3 rebase) Hi， Could you help to share if there will be different behaviour inside guests with different machine types? I get the same result with 'q35' and 'pc' machine type with qemu-kvm-6.2.0-1.rc2.scrmod+el8.6.0+13458+219ac088.wrb211124. 1. Boot guest with '-smp 8' 2. check CPU topology inside the guest. # lscpu Core(s) per socket: 8 Socket(s): 1 Thanks. Best regards Liu Nana (In reply to liunana from comment #2) > (In reply to Dr. David Alan Gilbert from comment #1) > > Fixed in: > > https://gitlab.com/redhat/rhel/src/qemu-kvm/qemu-kvm/-/merge_requests/85 > > (on top of rc3 rebase) > > Hi， > > > Could you help to share if there will be different behaviour inside guests > with different machine types? > I get the same result with 'q35' and 'pc' machine type with > qemu-kvm-6.2.0-1.rc2.scrmod+el8.6.0+13458+219ac088.wrb211124. > > 1. Boot guest with '-smp 8' > > 2. check CPU topology inside the guest. > # lscpu > Core(s) per socket: 8 > Socket(s): 1 > > > Thanks. > > > > Best regards > Liu Nana You should find the behaviour is the same on q35 and pc; but wihtout this patch it'll be like it shows you; on older qemu you sohuld find it shows socket(s) 8 With this patch it should also show Socket(s) 8 Could you help to set the ITR so that I can set the ITM? Thanks. Best regards Liu Nana QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass. Test Env:
5.14.0-39.el9.x86_64+debug
qemu-kvm-6.2.0-4.el9.x86_64
amd-milan-11.khw1.lab.eng.bos.redhat.com
Guest: 5.14.0-44.el9.x86_64
Test steps:
1. Boot guest with '-smp 8'
2. lscpu inside guest.
# lscpu
BIOS Model name: RHEL-8.5.0 PC (Q35 + ICH9, 2009)
CPU family: 25
Model: 1
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 8
3. check 'pc' machine type, get the same results:
# lscpu
BIOS Model name: RHEL 7.6.0 PC (i440FX + PIIX, 1996)
CPU family: 25
Model: 1
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 8
Please help to check this, if no more comments I will move this bug to VERIFIED, thanks.
Best regards
Liu Nana
Yes, that's right - you see the 'smp 8' has turned into 8 sockets x 1 core. I think if you try it with the 8.6.0 or 9.0.0 q35 machine type you'll see probably 1 socket, 8 cores. (In reply to Dr. David Alan Gilbert from comment #11) > Yes, that's right - you see the 'smp 8' has turned into 8 sockets x 1 core. > I think if you try it with the 8.6.0 or 9.0.0 q35 machine type you'll see > probably 1 socket, 8 cores. Yes, I can see the difference with 9.0.0 q35 machine type with qemu-kvm-6.2.0-5.el9.x86_64. Inside guest: #lscpu BIOS Model name: RHEL-9.0.0 PC (Q35 + ICH9, 2009) Thread(s) per core: 1 Core(s) per socket: 8 Socket(s): 1 Move this bug to verified now, thanks. 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 (new packages: qemu-kvm), 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/RHBA-2022:2307 |
Description of problem: cohuck spotted that I'd missed the prefer_sockets line in the machine option compatibility for the x86 machine types; it looks like th_huth nailed it for s390. (We'll also need this on 8.6, so probably need it for Power and hmm aarch?) Version-Release number of selected component (if applicable): 6.2 rebase How reproducible: 100% Steps to Reproduce: 1. start a guest with -smp 8 2. lscpu Actual results: Core(s) per socket: 8 Socket(s): 1 Expected results: Core(s) per socket: 1 Socket(s): 8 Additional info: