From: Roman Kagan <rkagan@virtuozzo.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Denis Plotnikov <dplotnikov@virtuozzo.com>,
<linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
<rkrcmar@redhat.com>
Subject: Re: [RFC PATCH v3 0/6] KVM: x86: avoid redundant REQ_EVENT
Date: Tue, 20 Dec 2016 13:01:55 +0300 [thread overview]
Message-ID: <20161220100155.GF2081@rkaganb.sw.ru> (raw)
In-Reply-To: <672a23fe-3df7-dd1b-27ee-4b453ca33236@redhat.com>
On Mon, Dec 19, 2016 at 03:30:17PM +0100, Paolo Bonzini wrote:
>
>
> On 19/12/2016 14:05, Denis Plotnikov wrote:
> >>
> > This new patch-set does avoid unnecessary interrupt re-injections -
> > checked.
> >
> > The test (MS Windows, sending messages between multiple windows using
> > windows-specific interface),
> > which showed performance growth with "[PATCH v2] KVM: x86: avoid
> > redundant REQ_EVENT" showed pretty much the same performance level with
> > this new patch-set.
> > The test score difference (+2.4% to [PATCH v2]) is within the tolerance
> > range(5%).
> >
> > The test score on mainstream v4.9 kernel CPU Intel i5-2400, guest
> > Windows Server 2012 2VCPU, 2GB:
> >
> > without patch: 31510 (+/- 4%)
> > with patch: 36270 (+/- 5%)
> >
> > difference = (36270-31510)/31510 * 100 = +15% -- looks good!
>
> Awesome! I hope it also qualifies as less ugly. :)
Absolutely. FWIW
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Roman.
prev parent reply other threads:[~2016-12-20 11:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-19 9:47 [RFC PATCH v3 0/6] KVM: x86: avoid redundant REQ_EVENT Paolo Bonzini
2016-12-19 9:47 ` [PATCH 1/6] KVM: x86: add VCPU stat for KVM_REQ_EVENT processing Paolo Bonzini
[not found] ` <20161220092101.GE2081@rkaganb.sw.ru>
2016-12-20 9:32 ` Paolo Bonzini
2016-12-19 9:47 ` [PATCH 2/6] KVM: lapic: do not set KVM_REQ_EVENT unnecessarily on EOI Paolo Bonzini
2016-12-23 12:08 ` Paolo Bonzini
2016-12-19 9:47 ` [PATCH 3/6] KVM: vmx: speed up TPR below threshold vmexits Paolo Bonzini
2016-12-19 9:47 ` [PATCH 4/6] KVM: lapic: avoid unnecessary KVM_REQ_EVENT on IRR scan Paolo Bonzini
2016-12-19 9:47 ` [PATCH 5/6] KVM: lapic: do not set KVM_REQ_EVENT unnecessarily on PPR update Paolo Bonzini
2016-12-19 9:47 ` [PATCH 6/6] KVM: lapic: do not scan IRR when delivering an interrupt Paolo Bonzini
2016-12-20 17:11 ` Paolo Bonzini
2016-12-19 13:05 ` [RFC PATCH v3 0/6] KVM: x86: avoid redundant REQ_EVENT Denis Plotnikov
2016-12-19 14:30 ` Paolo Bonzini
2016-12-20 10:01 ` Roman Kagan [this message]
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