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DescriptionMichal Privoznik
2022-09-05 14:18:45 UTC
+++ This bug was initially created as a clone of Bug #1643887 +++
(In reply to Vitaly Kuznetsov from comment #6)
> The most up-to-date list of enlightenments in QEMU upstream is:
>
> hv-relaxed
> hv-vapic
> hv-spinlocks
> hv-vpindex
> hv-runtime
> hv-crash
> hv-time
> hv-synic
> hv-stimer
> hv-tlbflush
> hv-ipi
> hv-reset
> hv-frequencies
> hv-reenlightenment
> hv-evmcs (Intel only)
> hv-stimer-direct
These ^^ are supported.
> hv-avic (== hv-apicv)
> hv-emsr-bitmap
> hv-xmm-input
> hv-no-nonarch-coresharing = on/off/auto (careful! Can only be used with
> proper vCPU pinning!)
And these ^^ need to be implemented yet. What's the priority? I haven't found any libvirt RFE for these, should I create one?
--- Additional comment from Vitaly Kuznetsov on 2022-09-05 15:34:17 CEST ---
(In reply to Michal Privoznik from comment #8)
> > hv-avic (== hv-apicv)
> > hv-emsr-bitmap
> > hv-xmm-input
> > hv-no-nonarch-coresharing = on/off/auto (careful! Can only be used with
> > proper vCPU pinning!)
>
> And these ^^ need to be implemented yet. What's the priority? I haven't
> found any libvirt RFE for these, should I create one?
The priority should be 'normal' I believe, all these give moderate performance
improvement for certain scenarios.
'hv-avic' is supported since QEMU-6.2, hv-xmm-input and hv-emsr-bitmap are new
(QEMU-7.1). 'hv-no-nonarch-coresharing' is old (QEMU-4.2) but it's very specific
and hard to use properly.
We have a few more enlightenments to add:
- hv-xmm-input
- hv-tlbflush-ext
- hv-tlbflush-direct
these are supported in QEMU startin 7.1.0 but kernel support for the last two is
only in 6.2.
Comment 3RHEL Program Management
2023-09-22 13:31:32 UTC
Issue migration from Bugzilla to Jira is in process at this time. This will be the last message in Jira copied from the Bugzilla bug.
Comment 4RHEL Program Management
2023-09-22 13:34:18 UTC
This BZ has been automatically migrated to the issues.redhat.com Red Hat Issue Tracker. All future work related to this report will be managed there.
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