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Enthusiast

ISE Key Performance Metrics - Units?

Hi all,

I'd like to get some more information on the key performance metrics (KPMs) in ISE ---- specifically, what units are they using to report some of the metrics?

Specifically, how is "server load" calculated, and how is latency per request reported?  I'm pretty sure it's not UNIX server load since mine ranges from 25 to 50.

Thanks!

Justin

Key Performance Metrics
Key Performance Metrics provide high level overview of some of the key metrics per server. Following is the brief description about columns in the report-
  Logged Time - Time data is collected - data collected every 5 mins is aggregated hourly
  Server - Server name in the deployment
  Radius Requests Per Hr - Number of radius requests per hour for selected PSN server
  Logged To MNT Per Hr - Number of such requests logged to MNT database for selected PSN server
  Noise Per Hr - Calculated as difference between radius requests and logged to mnt per hour
  Suppression Per Hr - Calculated as percentage of Noise w.r.t radius requests per hour for selected PSN server
  Avg Load - Average server load for selected server
  Max Load - Maximum server load for selected server
  Avg Latency Per Request - Average latency per radius request for selected PSN server
  Avg TPS - Average transactions per second caculated as number of radius requests served per second by PSN server

  

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Cisco Employee

Re: ISE Key Performance Metrics - Units?

The data in top is a snapshot at one particular time. The KPM is usually generated and averaged over each hour for the last 24 hours.

Thanks to Craig in correcting me.

KPM data are calculated differently from the raw data points, as below:

                         ROUND (AVG (load_avg / cpu_count) * 100, 2) avg_load,

                         ROUND (MAX (load_avg / cpu_count) * 100, 2) max_load

We should probably call them as per-CPU load average percentiles.

7 REPLIES 7
Advocate

Re: ISE Key Performance Metrics - Units?

The metrics are derived from MnT and logs acquired from auth process.  For example...

2017-04-17 22:22:34.295 +05:30 0000000341 70000 NOTICE System-Stats: ISE Utilization, ConfigVersionId=66, SysStatsUtilizationCpu=4.87%, SysStatsUtilizationNetwork=eth0: rcvd = 86848\; sent = 4869 \;rcvd_dropped = 0\; sent_dropped = 0, SysStatsUtilizationMemory=77.77%, SysStatsUtilizationDiskIO=2.17%, SysStatsUtilizationDiskSpace=14% /, SysStatsUtilizationDiskSpace=23% /boot, SysStatsUtilizationDiskSpace=2% /storedconfig, SysStatsUtilizationDiskSpace=1% /tmp, SysStatsUtilizationDiskSpace=17% /opt, SysStatsUtilizationDiskSpace=1% /localdisk, AverageRadiusRequestLatency=0, AverageTacacsRequestLatency=0, DeltaRadiusRequestCount=0, DeltaTacacsRequestCount=0, SysStatsUtilizationLoadAvg=0.20, SysStatsCpuCount=4, SysStatsProcessMemoryMB=7926, ActiveSessionCount=0,

That said, I have had an ongoing discussion with engineering to provide better information to clarify the data represented by KPM so that it is more consumable and actionable.

/Craig

Enthusiast

Re: ISE Key Performance Metrics - Units?

Thanks. That is helpful, but I do need to know the measurement units for latency and load.

-Justin

Cisco Employee

Re: ISE Key Performance Metrics - Units?

Latency is in milliseconds.

System load averages is in processes, as it is the average number of processes (for the past 5 minutes on the time of collection) that are either in a runnable or uninterruptable state.

Enthusiast

Re: ISE Key Performance Metrics - Units?

Got it.  So the system load average is not really load, but the number of processes running in ISE (such as would be shown in the "show application status ise" ?

Thank you,

Justin

Cisco Employee

Re: ISE Key Performance Metrics - Units?

This is how Linux/Unix represents "loads". In ISE admin CLI, "tech top" shows the numbers. This is not what shown by "show application status ise".

ise-1/admin# tech top

Invoking tech top. Press Control-C to interrupt.

top - 16:01:24 up 33 days, 14:16,  1 user,  load average: 1.21, 0.50, 0.39

...

Enthusiast

Re: ISE Key Performance Metrics - Units?

The KPM report in ISE doesn't seem to correlate with 'tech top' either.

ISE KPM report shows average load around 20-28.

Tech Top shows load average around 0.66 to 0.75....

So what is the load really saying in the KPM report in ISE?

Thanks!
Justin

tech top.PNG

ISE KPMs.PNG

Cisco Employee

Re: ISE Key Performance Metrics - Units?

The data in top is a snapshot at one particular time. The KPM is usually generated and averaged over each hour for the last 24 hours.

Thanks to Craig in correcting me.

KPM data are calculated differently from the raw data points, as below:

                         ROUND (AVG (load_avg / cpu_count) * 100, 2) avg_load,

                         ROUND (MAX (load_avg / cpu_count) * 100, 2) max_load

We should probably call them as per-CPU load average percentiles.