[Xen-users] Paravirt network interfaces and snmp

["David Brain" <dbrain@xxxxxxxxxxxxx>]

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.

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