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

[ma qiang <maqiang1984@xxxxxxxxx>]

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 <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]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:pasik@xxxxxx

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