Home / server / Questions / 508845
Accepted
Oleg Vazhnev
Asked: 2013-05-18 22:08:14 +0800 CST

why ACPI SLIT is disabled by default?

  • 772

I've found such option on my server:

ACPI SLIT Preferences NOTE: This option is available on Gen8 servers with Intel processors. ACPI SLIT (System Locality Information Table) describes the relative access times between processors,memory subsystems, and I/O subsystems. Operating systems that support SLIT can improve performance by allocating resources and workloads more efficiently.Options include:

  • Enable
  • Disable (default)

Sounds cool, but I wonder why it disabled by default? More or less I understand advantages of turning it on, but what is disadvantages of turning it on?

hp

1 Answers

  1. Best Answer

    The same applies to virtualization related settings (VT-x, Vanderpool).
    As far as I know ALL hardware manufacturers disable such features by default as a matter of principle.

    Why ? Good question.
    Normally an OS that doesn't support or need the feature won't be bothered by it, if it is on.
    (At least I have never encountered such a case myself and I have never heard of this happening either.)

    As far as I know this appears some sort of (legal) safety measure by the manufactures, driven by the fear for costly lawsuits.
    After all: most manufacturers have a legal entity in lawsuit happy USA jurisdictions...
    "If it is off, it can't cause problems, so we can't be liable for anything..."

    • 2