[libvirt] why is network i/o always zero?

[Daniel P. Berrange]

On Wed, May 11, 2011 at 09:32:53PM +0800, 黄亮 wrote:
> hi all
> 
> I'm using Xen on CentOS.I wanna monitor the network activity of a domain. When I use Domain.InterfaceStats( ... ), which is the C# binding of virDomainInterfaceStats, it returns -1.
> 
> I wonder if the function is not supported by Xen. So I using "domifstat", and I get
> 
> vif1.0 rx_bytes 0
> vif1.0 rx_packets 0
> vif1.0 rx_errs 0
> vif1.0 rx_drop 0
> vif1.0 tx_bytes 0
> vif1.0 tx_packets 0
> vif1.0 tx_errs 0
> vif1.0 tx_drop 0
> 
> but it never change even when I use that domain to ping another.

You don't mention if it is a paravirt or HVM guest. If it is a
HVM guest, then you don't get any statistics, unless the paravirt
drivers are installed.

Daniel
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