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Re: [Xen-devel] Problems with xenmon

from [Ananth] [Permanent Link][Original]
To: Jia Rao <rickenrao@xxxxxxxxx>
Subject: Re: [Xen-devel] Problems with xenmon
From: Ananth <cbananth@xxxxxxxxx>
Date: Sat, 16 May 2009 07:02:03 +0530
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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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