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Performance Tuning Guidelines for Windows Server 2012 April 12, 2013 Abstract
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| bet | 34/218 | | Sana | 21.03.2017 | | Hajmi | 1.5 Mb. | | #1065 |
Many hardware systems use System Management Interrupts (SMI) for a variety of maintenance functions, including reporting of error correction code (ECC) memory errors, legacy USB compatibility, fan control, and BIOS controlled power management. The SMI is the highest priority interrupt on the system and places the CPU in a management mode, which preempts all other activity while it runs an interrupt service routine, typically contained in BIOS.
Unfortunately, this can result in latency spikes of 100 microseconds or more. If you need to achieve the lowest latency, you should request a BIOS version from your hardware provider that reduces SMIs to the lowest degree possible. These are frequently referred to as “low latency BIOS” or “SMI free BIOS.” In some cases, it is not possible for a hardware platform to eliminate SMI activity altogether because it is used to control essential functions (for example, cooling fans).
Note The operating system can exert no control over SMIs because the logical processor is running in a special maintenance mode, which prevents operating system intervention.
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