linux-kernel - Re: [kvm-unit-tests Patch 0/5] Fix PMU test failures on Sapphire Rapids

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Date:   Wed, 25 Oct 2023 23:47:00 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Dapeng Mi <dapeng1.mi@...ux.intel.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhang Xiong <xiong.y.zhang@...el.com>,
        Jim Mattson <jmattson@...gle.com>,
        Like Xu <like.xu.linux@...il.com>,
        Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [kvm-unit-tests Patch 0/5] Fix PMU test failures on Sapphire
 Rapids

On Tue, Oct 24, 2023, Dapeng Mi wrote:
> When running pmu test on Intel Sapphire Rapids, we found several
> failures are encountered, such as "llc misses" failure, "all counters"
> failure and "fixed counter 3" failure.

hmm, I have tested your series on a SPR machine. It looks like, all "llc
misses" already pass on my side. "all counters" always fail with/without
your patches. "fixed counter 3" never exists... I have "fixed
cntr-{0,1,2}" and "fixed-{0,1,2}"

You may want to double check the requirements of your series. Not just
under your setting without explainning those setting in detail.

Maybe what I am missing is your topdown series? So, before your topdown
series checked in. I don't see value in this series.

Thanks.
-Mingwei
> 
> Intel Sapphire Rapids introduces new fixed counter 3, total PMU counters
> including GP and fixed counters increase to 12 and also optimizes cache
> subsystem. All these changes make the original assumptions in pmu test
> unavailable any more on Sapphire Rapids. Patches 2-4 fixes these
> failures, patch 0 remove the duplicate code and patch 5 adds assert to
> ensure predefine fixed events are matched with HW fixed counters.
> 
> Dapeng Mi (4):
>   x86: pmu: Change the minimum value of llc_misses event to 0
>   x86: pmu: Enlarge cnt array length to 64 in check_counters_many()
>   x86: pmu: Support validation for Intel PMU fixed counter 3
>   x86: pmu: Add asserts to warn inconsistent fixed events and counters
> 
> Xiong Zhang (1):
>   x86: pmu: Remove duplicate code in pmu_init()
> 
>  lib/x86/pmu.c |  5 -----
>  x86/pmu.c     | 17 ++++++++++++-----
>  2 files changed, 12 insertions(+), 10 deletions(-)
> 
> 
> base-commit: bfe5d7d0e14c8199d134df84d6ae8487a9772c48
> -- 
> 2.34.1
>