Re: [Xen-devel] Performance numbers on PV-on-HVM

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Sep 28, 2010 at 03:58:50PM +0530, Jagadish Nadimpalli wrote:
>    Hi,
> 
>    With latest PV-on-HVM branch 2.6.35-rc5-pvhvm-v7, the network performance
>    results(Using netperf -H <IP address of netserver> -l 100) range from
>    700Mbps to 730Mbps. Please note that this is similar to the old branch
>    2.6.34-pvhvm. One difference is that the latest branch is much more
>    stable. The old branch code used to freeze a lot.
> 

These benchmark results are still on a non-EPT CPU?

-- Pasi

>    Thanks & Regards,
>    Jagadish
> 
>    On Mon, Sep 27, 2010 at 9:18 PM, Jagadish Nadimpalli
>    <[1]jagadish.nadimpalli@xxxxxxxxxxxxxxxxxx> wrote:
> 
>      Hi Stefano,
> 
>      Thanks a lot for your responses.
> 
>      Thanks & Regards,
>      Jagadish
> 
>      On Mon, Sep 27, 2010 at 6:41 PM, Stefano Stabellini
>      <[2]stefano.stabellini@xxxxxxxxxxxxx> wrote:
> 
>        On Mon, 27 Sep 2010, Jagadish Nadimpalli wrote:
>        > Did anybody calculate benchmark network performance numbers for
>        PV-on-HVM so that I can compare? The link provided by you
>        > has some numbers as follows. This don't has the data rate that is
>        transferred via a network interface.
>        >
>        > Average Optimal load -j 4 Run (std deviation):
>        > Elapsed Time 215.307 (10.1294)
>        > User Time 632.503 (6.4785)
>        > System Time 115.497 (4.53905)
>        > Percent CPU 347.333 (15.885)
>        > Context Switches 43319.7 (2088.39)
>        >
>        > Sleeps 48950 (3140.18)
>        >
> 
>        I don't think anyone did so far.
> 
>        > ??
>        > ??
>        > I verified the "xm dmesg" and there is no print of "Extended Page
>        Tables (EPT)". Does this mean that the extended page
>        > table support is not there? Can I enable this through BIOS option?
>        If it can't be enabled using BIOS option, could you
>        > please let me know the Intel chipset series which has this support.
>        >
>        >
> 
>        I don't think that EPT can be enable/disable via BIOS, probably your
>        cpu doesn't support it.
>        The first Intel cpu series to support EPT is Nehalem:
> 
>        [3]http://en.wikipedia.org/wiki/Nehalem_%28microarchitecture%29
> 
>        all the new desktops and servers sold today should have ept support,
>        you
>        can check on the intel website to be sure.
> 
> References
> 
>    Visible links
>    1. mailto:jagadish.nadimpalli@xxxxxxxxxxxxxxxxxx
>    2. mailto:stefano.stabellini@xxxxxxxxxxxxx
>    3. http://en.wikipedia.org/wiki/Nehalem_%28microarchitecture%29

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