Chapter 5. Setting BIOS parameters for system tuning

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The BIOS plays a key role in the functioning of the system. By configuring the BIOS parameters correctly you can significantly improve the system performance.


Every system and BIOS vendor uses different terms and navigation methods. For more information about BIOS settings, see the BIOS documentation or contact the BIOS vendor.

5.1. Disabling power management to improve response times

BIOS power management options help save power by changing the system clock frequency or by putting the CPU into one of various sleep states. These actions are likely to affect how quickly the system responds to external events.

To improve response times, disable all power management options in the BIOS.

5.2. Improving response times by disabling error detection and correction units

Error Detection and Correction (EDAC) units are devices for detecting and correcting errors signaled from Error Correcting Code (ECC) memory. Usually EDAC options range from no ECC checking to a periodic scan of all memory nodes for errors. The higher the EDAC level, the more time the BIOS uses. This may result in missing crucial event deadlines.

To improve response times, turn off EDAC. If this is not possible, configure EDAC to the lowest functional level.

5.3. Improving response time by configuring System Management Interrupts

System Management Interrupts (SMIs) are a hardware vendors facility to ensure that the system is operating correctly. The BIOS code usually services the SMI interrupt. SMIs are typically used for thermal management, remote console management (IPMI), EDAC checks, and various other housekeeping tasks.

If the BIOS contains SMI options, check with the vendor and any relevant documentation to determine the extent to which it is safe to disable them.


While it is possible to completely disable SMIs, Red Hat strongly recommends that you do not do this. Removing the ability of your system to generate and service SMIs can result in catastrophic hardware failure.

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