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

[Pasi Kärkkäinen <pasik@xxxxxx>]

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? 

-- Pasi


>    On Mon, Sep 6, 2010 at 2:44 PM, ma qiang <[1]maqiang1984@xxxxxxxxx> 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.
>      > 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.
>      > 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%
>      On Mon, Sep 6, 2010 at 2:08 PM, Pasi Kärkkäinen <[2]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:maqiang1984@xxxxxxxxx
>    2. mailto:pasik@xxxxxx

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