From: Sean Christopherson <seanjc@google.com>
To: Bernhard Kauer <bk@alpico.io>
Cc: kvm@vger.kernel.org, Chao Gao <chao.gao@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v2] KVM: x86: Drop the kvm_has_noapic_vcpu optimization
Date: Wed, 11 Dec 2024 09:16:11 -0800 [thread overview]
Message-ID: <Z1nI22dBe01m3_k6@google.com> (raw)
In-Reply-To: <Z1f45XzpgDMC2cvI@mias.mediconcil.de>
On Tue, Dec 10, 2024, Bernhard Kauer wrote:
> On Mon, Dec 09, 2024 at 05:40:48PM -0800, Sean Christopherson wrote:
> > > With a single vCPU pinned to a single pCPU, the average latency for a CPUID exit
> > > goes from 1018 => 1027 cycles, plus or minus a few. With 8 vCPUs, no pinning
> > > (mostly laziness), the average latency goes from 1034 => 1053.
>
> Are these kind of benchmarks tracked somewhere automatically?
I'm not sure what you're asking. The benchmark is KVM-Unit-Test's[*] CPUID test,
e.g. "./x86/run x86/vmexit.flat -smp 1 -append 'cpuid'".
git@gitlab.com:kvm-unit-tests/kvm-unit-tests.git[*]
next prev parent reply other threads:[~2024-12-11 17:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-21 10:22 [PATCH v2] KVM: x86: Drop the kvm_has_noapic_vcpu optimization Bernhard Kauer
2024-12-10 1:22 ` Sean Christopherson
2024-12-10 1:40 ` Sean Christopherson
2024-12-10 8:16 ` Bernhard Kauer
2024-12-11 17:16 ` Sean Christopherson [this message]
2024-12-12 10:19 ` Bernhard Kauer
2024-12-12 15:16 ` Sean Christopherson
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