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

from [Fajar A. Nugraha]

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To:	Nathan March <nathan@xxxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-users] Snmp CpuRawIdle showing double?
From:	"Fajar A. Nugraha" <list@xxxxxxxxx>
Date:	Wed, 6 Oct 2010 08:33:06 +0700
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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 1.3.6.1.4.1.2021.11.53 && sleep 60 && snmpwalk -v 2c -c 'XXXXXXX' nathanxen1 1.3.6.1.4.1.2021.11.53

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.

Fajar

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