Re: [Xen-users] Network nightmare. Is NAT better than bridge for DomU to DomU?

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

G. Michael Carter wrote:
> OS: 
> *Dom0* - Fedora 8 (x86_64, xen:3.1.2-2.fc8)
> *DomU*:
> Fedora 9 (x2 - i686, xen:3.2.0-12.fc9)
> Oracle Enterprise Linux 5.1 (x86_64, xen:3.0.3-64.el5_2.1), 
> CentOS 5 (i686, xen: 3.0.3-64.el5_2.1),
> Fedora 7 (x86_64, xen: 3.1.2-2.fc7)
>
> I know xen on the Dom0 is the only important one.   All PV running on 
> a Intel Dual Core Pentium D 2.8Ghz (only one without HVM grrr)
> To test I've tried iperf, scp files, and DB link from Oracle -> Oracle.  
>
> iperf I get 80-320 Mbps.
At first glance I assume it's cpu problem. Try this :
- disable hyperthread. That should make xen reports only two cpus (which 
is the number of cores you have)
- assign dom0 one cpu only, on a dedicated core with xm vcpu-set and 
xm-vcpu-pin (e.g. cpu 0)
- assign both test domU to other cpu (in your case this would be cpu 1) 
with xm vcpu-pin or modifying domU config file
Regards,

Fajar

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