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From: Wincy Van <>
To: Paolo Bonzini <>,,
	"Wanpeng Li" <>,
	"Jan Kiszka" <>, 范文一 <>
Subject: [PATCH 0/5] KVM: nVMX: Enable nested apicv support.
Date: Fri, 16 Jan 2015 13:49:10 +0800	[thread overview]
Message-ID: <> (raw)

In nested vmx, the efficiency of interrupt virtualization is
very important, especially in high throughput scenes.

This patch set enables nested apicv support, which makes a
huge improvement in nested interrupt virtualization.

I also have done some simple tests:
L0: Intel Xeon E5-2630 v2
L1: CentOS 6.5 with 3.10.64-1.el6.elrepo.x86_64 kernel
    16 vcpus, 32GB memory.

L2: Windows Server 2008 R2 Datacenter
    8 vcpus, 16GB memory.

 1. Run wprime 32M, 8 threads.

         original                nested apicv

          7.782s                   7.172s

    Improvement: 7.8%

 2. Run iperf -s -w 64k in L1,
    iperf -c -p 5001 -i 1 -t 30 -P 8 -w 64k in L2

         original                nested apicv

        2.12 Gbits/s             3.50 Gbits/s

    Improvement: 65.0%


L2: CentOS 6.5 with 2.6.32-431 kernel
    8 vcpus, 16GB memory.

 1. Run iperf -s -w 64k in L1,
    iperf -c -p 5001 -i 1 -t 30 -P 8 -w 64k in L2

         original                nested apicv

        6.58 Gbits/s             14.2 Gbits/s

    Improvement: 115.8%

Wincy Van (5):
  KVM: nVMX: Make nested control MSRs per-cpu.
  KVM: nVMX: Enable nested virtualize x2apic mode.
  KVM: nVMX: Enable nested apic register virtualization.
  KVM: nVMX: Enable nested virtual interrupt delivery.
  KVM: nVMX: Enable nested posted interrupt processing.

 arch/x86/kvm/vmx.c |  444 +++++++++++++++++++++++++++++++++++++++++-----------
 1 files changed, 355 insertions(+), 89 deletions(-)

             reply	other threads:[~2015-01-16  5:49 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-16  5:49 Wincy Van [this message]
2015-01-20  3:48 ` Wincy Van
2015-01-20  3:59   ` Zhang, Yang Z

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