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Processor Percent Interrupt Time

Microsoft.Linux.RHEL.5.Processor.PercentInterruptTime.Monitor (UnitMonitor)

Red Hat Enterprise Linux Server 5 Processor Percent Interrupt Time Monitor

Knowledge Base article:

Summary

The percentage of interrupt time (for a single processor) is high. System performance may be adversely affected.

Processor interrupt time is the time that a single processor spent receiving and servicing hardware interrupts. This value is an indirect indicator of the activity of devices that generate interrupts, such as the system clock, the mouse, storage controllers, data communication lines, network interface cards and other peripheral devices. These devices normally interrupt the processor when they have completed a task or require attention. Normal thread execution is suspended during interrupts.

The monitor threshold is analyzed against an average of values returned in polls to the agent, where the Number of Samples parameter controls the number of samples included in the calculation of the average. The value returned by the agent is the rolling average of the 5 most recent values queried at 1 minute intervals.

Configuration

Monitoring of individual processors is disabled by default. Enable monitoring by enabling the object discovery named 'Discover Red Hat Enterprise Linux Server 5 Processor.'

Default Configuration

Parameter

Default Value

Threshold

10

Interval (seconds)

300

Number of Samples

3

Overrides can be used to change the parameter values defined above for all instances or for specific instances or groups.

Causes

A high interrupt time condition most often indicates that there is a problem with a hardware device.

Resolutions

System log files should be checked to identify device errors.

Element properties:

TargetMicrosoft.Linux.RHEL.5.Processor
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeMicrosoft.Unix.WSMan.Performance.Filtered.Average.Threshold.MonitorType
RemotableTrue
AccessibilityPublic
Alert Message
Percentage Interrupt Time is too high
The threshold for the Processor\\% Interrupt Time\ performance counter has been exceeded. The value that exceeded the threshold is: {0}.
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.Linux.RHEL.5.Processor.PercentInterruptTime.Monitor" Accessibility="Public" Target="Microsoft.Linux.RHEL.5.Processor" TypeID="Unix!Microsoft.Unix.WSMan.Performance.Filtered.Average.Threshold.MonitorType" Enabled="true" ParentMonitorID="SystemHealth!System.Health.PerformanceState">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="Microsoft.Linux.RHEL.5.Processor.PercentInterruptTime.AlertMessage">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>Error</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Data/Context/Value$</AlertParameter1>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState HealthState="Success" MonitorTypeStateID="UnderThreshold" ID="UnderThreshold"/>

    <OperationalState HealthState="Error" MonitorTypeStateID="OverThreshold" ID="OverThreshold"/>

  </OperationalStates>

  <Configuration>

    <TargetSystem>$Target/Host/Property[Type="Unix!Microsoft.Unix.Computer"]/NetworkName$</TargetSystem>

    <Uri>http://schemas.microsoft.com/wbem/wscim/1/cim-schema/2/SCX_ProcessorStatisticalInformation?__cimnamespace=root/scx</Uri>

    <Filter/>

    <SplitItems>true</SplitItems>

    <Interval>300</Interval>

    <ObjectName>Processor</ObjectName>

    <CounterName>% Interrupt Time</CounterName>

    <InstanceName>$Target/Property[Type="Unix!Microsoft.Unix.Processor"]/PerfmonInstance$</InstanceName>

    <InstanceProperty>/DataItem/WsManData/*[local-name(.)='SCX_ProcessorStatisticalInformation']/*[local-name(.)='Name']</InstanceProperty>

    <Value>$Data/WsManData/*[local-name(.)='SCX_ProcessorStatisticalInformation']/*[local-name(.)='PercentInterruptTime']$</Value>

    <Threshold>10</Threshold>

    <NumSamples>3</NumSamples>

  </Configuration>

</UnitMonitor>