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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="ts_win-cpu-usage-rept">
<title>Inaccurate Windows CPU Usage Reporting</title>
<body>
<p>
CPU usage reporting tools which come with Windows, such as Task
Manager or Resource Monitor, do not take the time spent
processing hardware interrupts into account. If the interrupt
load is heavy, with thousands of interrupts per second, CPU
usage may be significantly underreported.
</p>
<p>
This problem affects Windows as both host and guest OS.
Sysinternals tools, such as Process Explorer, do not suffer from
this problem.
</p>
</body>
</topic>
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