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Re: [Xen-users] Snmp CpuRawIdle showing double?

  • To: "Fajar A. Nugraha" <list@xxxxxxxxx>
  • From: Nathan March <nathan@xxxxxx>
  • Date: Wed, 06 Oct 2010 14:44:05 -0700
  • Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 08 Oct 2010 08:50:15 -0700
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Tried updating the VM to and still happens. When I get a chance to update to the latest xen-unstable I'll test more.

- Nathan

On 10/5/2010 6:33 PM, Fajar A. Nugraha wrote:
On Wed, Oct 6, 2010 at 6:54 AM, Nathan March <nathan@xxxxxxxxxxxxxxxxxxxx> wrote:
 Having a strange issue where snmp polling a vm for the ssCpuRawIdle stats (and all the other raw cpu stats) shows up as double:

snmpwalk -v 2c -c 'XXXX' nathanxen1 && sleep 60 && snmpwalk -v 2c -c 'XXXXXXX' nathanxen1

UCD-SNMP-MIB::ssCpuRawIdle.0 = Counter32: 47631385
UCD-SNMP-MIB::ssCpuRawIdle.0 = Counter32: 47643353

(47643353 - 47631385) / 6000 * 100 = 199%

Except that this VM has a single cpu. Polling regular machines works fine with this logic and returns the expected numbers.

My guess is that it's kernel issue. Are you running newer pv_ops kernel? If yes, you should ask to xen-devel. I've checked RHEL's kernel-xen and newer xenlinux kernel, both return the correct values.

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