The issue is one of scale. Perfmon (the graph on your PC window) can't display 
the entirety of the data (that is, if you have 20,000 data points, it doesn't 
build a graph with all of those data points and then shrink the graph). Instead 
perfmon looks at how many pixels it has to display a graph, calculates how many 
data points that is, and picks that many data points. On average, in general, 
that works out OK.

If you have significant outliers - which is the case in your case example - it 
doesn't work out OK. The CSV is accurate.

...If you have follow-on questions, please post them on this mailing list so 
that others can benefit from the discussion.

From: Haritwal, Dhiraj [mailto:[email protected]]
Sent: Thursday, April 12, 2012 9:24 AM
To: NT System Admin Issues
Subject: RE: Perfmon data Difference in blg & csv format

Can anyone suggest on this? Appreciate your valuable comments.

Regards,
Dhiraj



From: Haritwal, Dhiraj 
[mailto:[email protected]]<mailto:[mailto:[email protected]]>
Sent: Monday, April 09, 2012 19:25
To: NT System Admin Issues
Subject: Perfmon data Difference in blg & csv format

Hi,

I have captured 1 week "%processor Time" for a Windows server 2008. now in 
Graph it's showing max as 60% but when I convert .blg file into .csv with 
Relog, showing max as 92%. Which one is correct? why 92% max not showing in 
graph? it was using default threashold 15 sec.


Regards,

Dhiraj

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