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Re: [Xen-users] The bottleneck of using multinetwork card?

On Mon, Sep 06, 2010 at 03:09:47PM +0800, ma qiang wrote:
>    >On Mon, Sep 06, 2010 at 02:52:16PM +0800, ma qiang wrote:
>    >    I  did the same test one the same computer in dom0 using only one
>    network
>    >    card,  the results show 1000M/sec.
>    >
>    >So what kind of guests are you using the benchmark from?
>    That is IXIA side based on centos 5.4 also.
>

In an earlier email you said it was Xen HVM guest.
You need to install PV-on-HVM drivers to it. It won't be fast otherwise.

Or then install it as a PV guest, that'll be fast out-of-the-box.

-- Pasi

>    On Mon, Sep 6, 2010 at 3:02 PM, Pasi Kärkkäinen <[1]pasik@xxxxxx> wrote:
> 
>      On Mon, Sep 06, 2010 at 02:58:32PM +0800, ma qiang wrote:
>      >    Sorry, I lost two words.
>      >     I reboot in bare linux not dom0, and have tested it on the same
>      computer
>      >    using only one network card. the results show 1000M.
>      >
> 
>      So what do you get from xen dom0?
>      In dom0 and bare linux, the results show both 1000M. But in domU, the
>      results are bad.
> 
> 
> 
>      Also if your guest is HVM, have you installed PV-on-HVM drivers?
>      without those drivers the performance will be bad from the guest.
>      PV-on-HVM drivers ? Sorry, I haven't installed that.  And I'm going
>      to search that.
> 
> 
> 
>      -- Pasi
>      >    On Mon, Sep 6, 2010 at 2:57 PM, ma qiang
>      <[1][2]maqiang1984@xxxxxxxxx> wrote:
>      >
>      >      20% is the vm's utilization of cpu, not dom0's.
>      >      My domU is hvm and centos linux.
>      >      "test server" is OK, and I have tested is on the same computer
>      using
>      >      only one network card. the results show 1000M.
>      >
>      >      On Mon, Sep 6, 2010 at 2:50 PM, Pasi Kärkkäinen
>      <[2][3]pasik@xxxxxx> wrote:
>      >
>      >        On Mon, Sep 06, 2010 at 02:44:59PM +0800, ma qiang wrote:
>      >        >    > Do you mean 250 Mbit/sec ?
>      >        >    Yes.
>      >        >    > You should get much more.. how are you measuring the
>      >        performance?
>      >        >    > What benchmark are you using?
>      >        >    I use an tool from ixia to test the network in the vm.
>      >
>      >        Try using some standard network performance testing tools
>      >        such as "iperf" or just regular ftp file transfers.
>      >        >    > Are both the eth0 and eth1 connected to the same
>      network/vlan?
>      >        >    Yes.  I run my test from another computer to connect to
>      vm0 and
>      >        vm1,  and
>      >        >    they all in the same switch.
>      >        >    To be noted my cards are both 1000m network card.
>      >        >
>      >
>      >        How is the 'test server' connected?
>      >
>      >        >    > When you run the network benchmark try running "xm top"
>      >        >    > to monitor the overall cpu usage.. also run "top" in
>      dom0
>      >        >    > to see if there's a big cpu usage in dom0.
>      >        >    No, the cpu is less than 20%
>      >
>      >        20% on dom0?
>      >        How about the domUs? Do they have big cpu usage?
>      >
>      >        What kind of guests do you have? pv? hvm? linux? windows?
>      >
>      >        -- Pasi
>      >        >    On Mon, Sep 6, 2010 at 2:08 PM, Pasi Kärkkäinen
>      >        <[1][3][4]pasik@xxxxxx> wrote:
>      >        >    > On Mon, Sep 06, 2010 at 01:58:10PM +0800, ma qiang
>      wrote:
>      >        >    >> Hi all,
>      >        >    >>     I have install xen 3.4.3 based on centos5.4.
>      >        >    >>     I changed a line in /etc/xen/xend-config.sxp like
>      below:
>      >        >    >> (network-script network-bridge)   ---->
>       (network-script
>      >        >    my-network-bridge)
>      >        >    >>
>      >        >    >> and #cat /etc/xen/scripts/my-network-script prints as
>      below:
>      >        >    >> #!/bin/sh
>      >        >    >> /etc/xen/scripts/network-bridge "$@" netdev=eth0
>      bridge=eth0
>      >        >    >> /etc/xen/scripts/network-bridge "$@" netdev=eth1
>      bridge=eth1
>      >        >    >>
>      >        >    >> Now I installed two vms, and set one vm using eth0,
>      then set
>      >        the other
>      >        >    >> using eth1.
>      >        >    >> So, I can connect internet in both vms.
>      >        >    >>
>      >        >    >> But now my problem is that the throughput of two
>      network card
>      >        is the
>      >        >    >> same as only one network card.
>      >        >    >> Another words, If I use the only one network card such
>      as eth0
>      >        for the
>      >        >    >> two vms, the throughput of eth0 is about 250m.
>      >        >    >> But when I set one vm use eth0 and the other use eth1,
>      the
>      >        total
>      >        >    >> throughput of eth0 and eth1 is about 250m too.
>      >        >    >>
>      >        >    >> That why?  Any bottleneck?
>      >        >    >> Thanks a lot.
>      >        >    >>
>      >        >    >
>      >        >    > Do you mean 250 Mbit/sec ?
>      >        >    >
>      >        >    > You should get much more.. how are you measuring the
>      >        performance?
>      >        >    > What benchmark are you using?
>      >        >    >
>      >        >    > Are both the eth0 and eth1 connected to the same
>      network/vlan?
>      >        >    >
>      >        >    > When you run the network benchmark try running "xm top"
>      >        >    > to monitor the overall cpu usage.. also run "top" in
>      dom0
>      >        >    > to see if there's a big cpu usage in dom0.
>      >        >    >
>      >        >    > -- Pasi
>      >        >    >
>      >        >    >
>      >        >
>      >        > References
>      >        >
>      >        >    Visible links
>      >        >    1. mailto:[4][5]pasik@xxxxxx
>      >
>      > References
>      >
>      >    Visible links
>      >    1. mailto:[6]maqiang1984@xxxxxxxxx
>      >    2. mailto:[7]pasik@xxxxxx
>      >    3. mailto:[8]pasik@xxxxxx
>      >    4. mailto:[9]pasik@xxxxxx
> 
> References
> 
>    Visible links
>    1. mailto:pasik@xxxxxx
>    2. mailto:maqiang1984@xxxxxxxxx
>    3. mailto:pasik@xxxxxx
>    4. mailto:pasik@xxxxxx
>    5. mailto:pasik@xxxxxx
>    6. mailto:maqiang1984@xxxxxxxxx
>    7. mailto:pasik@xxxxxx
>    8. mailto:pasik@xxxxxx
>    9. mailto:pasik@xxxxxx

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