Resplendence Software - LatencyMon Power Management Issues

CPU Power Management Issues

Many users have reported that they suffered latency problems due to CPU power management issues. Several problems can be solved by disabling variable speed related settings in the BIOS setup program such as:

Intel Speedstep technology

Intel TurboBoost technology

AMD Cool N Quiet technology

CPU C-states

It may be that these problems are caused because these power features cause the system to temporarily operate in SMM (System Management Mode). It may also be these latencies are caused by CPU bugs related to these features. Check out the following page regarding SMIs and CPU stalls.

LatencyMon documentation and articles

· Introduction
· Supported Operating Systems
· Professional Edition
· What's new ?
· FAQ
· How to use LatencyMon
· CPU Power Management issues
· Interrupt to user process latencies
· In Depth Latency Tests
· SMIs and CPU stalls
· Technical information
· "Windows and Real-time", guest article for kernel developers published by OSR

Note: this content is currently being updated.