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CPU Usage (Sample) not being shown.

Hi,

I'm developing a windows driver using Visual Studio and the WDK. Now, I'm in the process of profiling the code to solve some bottlenecks.

I used the tool Windows Performance Recorder to trace CPU usage. For now I'm only tracing CPU usage only.

In that machine the item CPU Usage has two items (among others). One is called "CPU Usage (Sampled)" and another called "CPU Usage (Precise)"

I need to use the sampled version, one reason it allows me to show the stack in a more easy way.

I have another machine where I debug and install the driver(I don't use the same machine for a number of reasons like debugging). So for doing  the analyzisis I downloaded the stand alone version of the product. But, after tracing the CPU usage the report only contains the "CPU Usage (Precise)", the Sampled version is missing.

Do you guys know what could be happening? 

Thanks in advance.

I attach screen shot of what I see in WPA.

Image may be NSFW.
Clik here to view.


Martin


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