Re: [Xen-devel] Problems with xenmon

[Ananth <cbananth@xxxxxxxxx>]

Hi,
Even I am facing the same problem. Irrespective of how much I/O I am doing from the guest OS, xenmon iocount shows 0 always. Were you able to figure out why this happens?

Please throw some light on this.

Thank you.

Warm Regards
Ananth

On Sun, May 3, 2009 at 2:38 AM, Jia Rao <rickenrao@xxxxxxxxx> wrote:

Hi all,

I just tried to use xenmon to monitor VMs in a Xen platform.

 

It is strange that the io_count reported by xenmon is always zero for all the domains (including dom0). I ran network intensive as well as disk intensive I/O workloads. Xenmon reports nothing about the I/O event.

 

The page transfer is always zero, but the page map and unmap have values.

Does xen still transfer data from dom0 from/to domu for I/O request? or all the data "transfer" is based on grant table map/unmap?

Best regards,

Jia.

 

FYI:

xen 3.3 (PV)

CentOS Linux 2.6.18-3 for dom0 and domU

Intel Xeon two 4-core

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