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    SubjectRe: [PATCH 0/15] KVM: optimize for MMIO handled
    On Wed, 08 Jun 2011 11:32:12 +0800
    Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> wrote:

    > On 06/08/2011 11:25 AM, Xiao Guangrong wrote:
    > > On 06/08/2011 11:11 AM, Takuya Yoshikawa wrote:
    > >> On Tue, 07 Jun 2011 20:58:06 +0800
    > >> Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> wrote:
    > >>
    > >>> The performance test result:
    > >>>
    > >>> Netperf (TCP_RR):
    > >>> ===========================
    > >>> ept is enabled:
    > >>>
    > >>> Before After
    > >>> 1st 709.58 734.60
    > >>> 2nd 715.40 723.75
    > >>> 3rd 713.45 724.22
    > >>>
    > >>> ept=0 bypass_guest_pf=0:
    > >>>
    > >>> Before After
    > >>> 1st 706.10 709.63
    > >>> 2nd 709.38 715.80
    > >>> 3rd 695.90 710.70
    > >>>
    > >>
    > >> In what condition, does TCP_RR perform so bad?
    > >>
    > >> On 1Gbps network, directly connecting two Intel servers,
    > >> I got 20 times better result before.
    > >>
    > >> Even when I used a KVM guest as the netperf client,
    > >> I got more than 10 times better result.
    > >>
    > >
    > > Um, which case did you test? ept = 1 or ept=0 bypass_guest_pf=0 or both?
    > >

    ept = 1 only.

    > >> Could you tell me a bit more details of your test?
    > >>
    > >
    > > Sure, KVM guest is the client, and it uses e1000 NIC, and uses NAT
    > > network connect to the netperf server, the bandwidth of our network
    > > is 100M.
    > >

    I see the reason, thank you!

    I used virtio-net and you used e1000.
    You are using e1000 to see the MMIO performance change, right?

    Takuya

    >
    > And this is my test script:
    >
    > #!/bin/sh
    >
    > echo 3 > /proc/sys/vm/drop_caches
    > ./netperf -H $HOST_NAME -p $PORT -t TCP_RR -l 60
    >


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