How do I disable "Processor Power and Utilization Monitoring" on an HP ProLiant server?

I'm tuning my server for low-latency. The HP low-latency guide suggests to disable this option "Processor Power and Utilization Monitoring" because:

Disables iLO Processor State Mode Switching and Insight Power Manager Processor Utilization Monitoring, and its associated SMI

Disabling System Management Interrupts to the processor provides one of the greatest benefits to low-latency environments. Disabling the Processor Power and Utilization Monitoring SMI has the greatest effect because it generates a processor interrupt eight times a second in G6, G7, and Gen8 servers.

But I can not find this option in BIOS. I've checked HP ROM-Based Setup Utility User Guide and it is not there.

How to disable "Processor Power and Utilization Monitoring", what exact steps should I do?

This is outlined in the document you linked under the "Tuning Procedures" heading.

In order to enter the Advanced system options menu for modifying a G6 or newer HP ProLiant for a low-latency application, you need to get to the main BIOS screen by pressing F9 during POST.

Once there, type Ctrl-A. This will present an additional menu named "Service Options" at the bottom of the list.

Select "Service Options" and you'll see the advanced system options, including the optimization you're looking to make. Change "Processor Power and Utilization Monitoring" to "Disabled". Escape and follow the prompts to save your changes.

One note. In realtime applications, there are a good number of things than can be tuned before resorting to this, but the setting is safe.