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

To:	"Fajar A. Nugraha" <list@xxxxxxxxx>
Subject:	Re: [Xen-users] Snmp CpuRawIdle showing double?
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
Dkim-signature:	v=1; a=rsa-sha1; c=relaxed; d=gt.net; h=message-id:date :from:mime-version:to:cc:subject:references:in-reply-to :content-type; s=mail; bh=iP6f36zlQV5q8bVyaiQlprp/Q6g=; b=MXe/M8 Rsk1J/H9J2QfuyfAExFNT/OEXuVcwm8huVrbKKJBidxjxpTd2QuuiSZauTTvT9wT APrUHXxCEgADB2XgRsBsXmdT8HXI8bGFsHiHBNzO/EGGReyrmY8lJAtM6BVwOFZ8 GHvogBfXn6SF7iBEhTFgtr2B9rkiSENNXDeB0=
Domainkey-signature:	a=rsa-sha1; c=nofws; d=gt.net; h=message-id:date :from:mime-version:to:cc:subject:references:in-reply-to :content-type; q=dns; s=mail; b=IGaDvx8Vu3q016K80tiEQ3UquYt7PdrP xqETE/qU/dhW5GvCKoyTryqa26cF/7Q/a/4RM6FhiVEBiMv+WE1PUazl7eL2CIns jhSrikW5s2i1WNJvt2B9Dyee+5vSSborDF3ETpSZyPYFj0+rJe8wirICD5Y6N5ZO 8Q/MkxDyY+c=
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to:	<AANLkTin6Lg6Tu+XDAXJFLSWganafm6BA+21=a5fOF1oX@xxxxxxxxxxxxxx>
List-help:	<mailto:xen-users-request@lists.xensource.com?subject=help>
List-id:	Xen user discussion <xen-users.lists.xensource.com>
List-post:	<mailto:xen-users@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References:	<4CABBABB.8090902@xxxxxxxxxxxxxxxxxxxx> <AANLkTin6Lg6Tu+XDAXJFLSWganafm6BA+21=a5fOF1oX@xxxxxxxxxxxxxx>
Sender:	xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent:	Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.9) Gecko/20100915 Thunderbird/3.1.4

Tried updating the VM to 2.6.32.24 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 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

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

WARNING - OLD ARCHIVES

xen-users

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