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

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] The bottleneck of using multinetwork card?
From: ma qiang <maqiang1984@xxxxxxxxx>
Date: Mon, 6 Sep 2010 13:58:10 +0800
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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:
/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.

Best Wishes!
Qiang Ma

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