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

To: Pasi Kärkkäinen <pasik@xxxxxx>

From: ma qiang <maqiang1984@xxxxxxxxx>

Date: Mon, 6 Sep 2010 14:44:59 +0800

Delivery-date: Sun, 05 Sep 2010 23:46:38 -0700

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List-id: Xen user discussion <xen-users.lists.xensource.com>

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 <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
>
>

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