WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

[Xen-users] Paravirt network interfaces and snmp

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Paravirt network interfaces and snmp
From: "David Brain" <dbrain@xxxxxxxxxxxxx>
Date: Thu, 15 Jan 2009 17:01:51 -0500
Delivery-date: Thu, 15 Jan 2009 14:02:48 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
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>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Hi,

We are using Zenoss to monitor a number of paravirt Linux hosts (using
the xen net device), it appears that an snmp query to the paravirt
hosts is reporting the interface speed as 10mbit - which is
significantly lower than what it really is (the dom0 host has 1gbit
networking).  This causes the occasional spurious error from the
monitoring tool as it notices that a host is using 75% of its
'Maximum' - i.e 7.5mbit - which of course isn't really a problem.

Looking a the output from snmpwalk it does look like the paravirt's
interface (eth0) is being reported as 10mbit

IF-MIB::ifIndex.1 = INTEGER: 1
IF-MIB::ifIndex.2 = INTEGER: 2
IF-MIB::ifIndex.3 = INTEGER: 3
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: sit0
IF-MIB::ifDescr.3 = STRING: eth0
IF-MIB::ifType.1 = INTEGER: softwareLoopback(24)
IF-MIB::ifType.2 = INTEGER: tunnel(131)
IF-MIB::ifType.3 = INTEGER: ethernetCsmacd(6)
IF-MIB::ifMtu.1 = INTEGER: 16436
IF-MIB::ifMtu.2 = INTEGER: 1480
IF-MIB::ifMtu.3 = INTEGER: 1500
IF-MIB::ifSpeed.1 = Gauge32: 10000000
IF-MIB::ifSpeed.2 = Gauge32: 0
IF-MIB::ifSpeed.3 = Gauge32: 10000000  <------This one!

Is there any way of indicating the 'speed' of an interface to the xen
paravirts to avoid this happening - it's obviously not critical, but
it's a nuisance when it generates 'noise' errors.


David.

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

<Prev in Thread] Current Thread [Next in Thread>
  • [Xen-users] Paravirt network interfaces and snmp, David Brain <=