Mailing List Archive: Xen: Users

10G network performance xen-4.1.2

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klinuxos at gmail

Apr 19, 2012, 5:46 PM

Post #1 of 2 (177 views)
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10G network performance xen-4.1.2

Hello,

I am testing 10G NICs with linux kernel 3.2.2 and Xen 4.1.2.
If I boot linux kernel 3.2.2 without Xen I get arount 7.3 Gbps performance
between 2 physical servers.
If I boot linux kernel 3.2.2 with xen-4.1.2 hypervisor I get 2 Gbps network
performance between server1-dom0 and server2-dom0. When a dom0 memory and
vcpus are increased (memory = 2G and vcpu = 4) I get maximum 5.2 Gbps
performance. While the maximum server1-domU and server2-domU network
performance I could achieve is 2 Gbps.

Any reason why Xen introduces such a big hit for network performance? Any
pointer or suggestions to try for improving network performance?

~shri

xenware at gmail

Apr 20, 2012, 12:11 AM

Post #2 of 2 (161 views)
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Re: 10G network performance xen-4.1.2 [In reply to]

I have heard about this bottleneck even on citrix forum. There should
be improvement in upcoming service pack for Citrix Server 6.

I guess you use bridged configuration. Have you tried to use Open
vSwitch http://openvswitch.org/ instead of classic bridging?

Br

Peter

Dne 20. dubna 2012 2:46 kernel user <klinuxos [at] gmail> napsal(a):
> Hello,
>
> I am testing 10G NICs with linux kernel 3.2.2 and Xen 4.1.2.
> If I boot linux kernel 3.2.2 without Xen I get arount 7.3 Gbps performance
> between 2 physical servers.
> If I boot linux kernel 3.2.2 with xen-4.1.2 hypervisor I get 2 Gbps network
> performance between server1-dom0 and server2-dom0. When a dom0 memory and
> vcpus are increased (memory = 2G and vcpu = 4) I get maximum 5.2 Gbps
> performance. While the maximum server1-domU and server2-domU network
> performance I could achieve is 2 Gbps.
>
> Any reason why Xen introduces such a big hit for network performance? Any
> pointer or suggestions to try for improving network performance?
>
> ~shri
>
> _______________________________________________
> Xen-users mailing list
> Xen-users [at] lists
> http://lists.xen.org/xen-users

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