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    SubjectRe: [PATCH 00/10] KVM: x86/pmu: Optimize triggering of emulated events
    On 10.11.2023 15:56, Sean Christopherson wrote:
    > On Thu, Nov 09, 2023, Dongli Zhang wrote:
    >> Hi Sean,
    >>
    >> On 11/9/23 18:28, Sean Christopherson wrote:
    >>> base-commit: ef1883475d4a24d8eaebb84175ed46206a688103
    >> May I have a silly question?
    >>
    >> May I have the tree that the commit is the base? I do not find it in kvm-x86.
    >>
    >> https://github.com/kvm-x86/linux/commit/ef1883475d4a24d8eaebb84175ed46206a688103
    > It's kvm-x86/next (which I failed to explicitly call out), plus two PMU series
    > as mentioned in the cover letter.
    >
    > https://lore.kernel.org/all/20231103230541.352265-1-seanjc@google.com
    > https://lore.kernel.org/all/20231110021306.1269082-1-seanjc@google.com

    Hi Sean,

    i have tested my testcase on your patchset, results look impressive, thank you for your work!
    Note, for AMD node PMU totally disabled case gave a bit worse results on kvm-next kernel vs stock
    latest mainstream.

    The difference is tiny though.

    *AMD node*: CPU: AMD Zen 3 (three!): AMD EPYC 7443P 24-Core Processor
    -----------------------------------------------------------------------------------------
    | Kernel | CPUID rate |
    -----------------------------------------------------------------------------------------
    | stock ms 6.6.0+ (commit 305230142ae0) | 1360250 |
    | stock ms 6.6.0+ + kvm.enable_pmu=0 | 1542894 (+13.4%) |
    | kvm-next ms 6.6.0+ + patches from Sean + kvm.enable_pmu=1 | 1498864 |
    | kvm-next ms 6.6.0+ + patches from Sean + kvm.enable_pmu=0 | 1526396 (+1.84%) |
    -----------------------------------------------------------------------------------------


    *Intel node*: CPU: Intel(R) Xeon(R) E-2136 CPU @ 3.30GHz
    -----------------------------------------------------------------------------------------
    | Kernel | CPUID rate |
    -----------------------------------------------------------------------------------------
    | stock ms 6.6.0+ | 1431608 |
    | stock ms 6.6.0+ + kvm.enable_pmu=0 | 1553839 (+8.5%) |
    | kvm-next ms 6.6.0+ + patches from Sean + kvm.enable_pmu=1 | 1559365 |
    | kvm-next ms 6.6.0+ + patches from Sean + kvm.enable_pmu=0 | 1582281 (+1.5%) |
    -----------------------------------------------------------------------------------------


    Note: in order to disable PMU completely i used "kvm" module "enable_pmu=0" option
    (not used KVM_PMU_CAP_DISABLEthis time).

    Hope that helps.

    --
    Best regards,

    Konstantin Khorenko,
    Virtuozzo Linux Kernel Team

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