git: kernel - Enhance machdep.cpu_idle_hlt

[Matthew Dillon]

commit a1874fede74175d4a8e5586c0c53329d16b9aa69
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Sun Mar 26 23:08:30 2017 -0700

    kernel - Enhance machdep.cpu_idle_hlt
    
    * Enhance machdep.cpu_idle_hlt.  It was not operating as advertised for
      settings 0 or 3+.  Add mode 5.
    
      0 - Now spins as documented (wasn't, before)
      1 - Uses MONITOR/MWAIT if supported, HLT otherwise
      2 - Uses mode (1) up to a point, then uses mode (3)
      3 - Always use the ACPI halt code.
      4 - Always use HLT (do not use MONITOR/MWAIT even if supported)
      5 - Always spin
    
    * Recode the default setting for AMD cpus (but no functional changes).
      Default setting is 3 for AMD.

Summary of changes:
 sys/platform/pc64/x86_64/machdep.c | 42 +++++++++++++++++++++++++-------------
 1 file changed, 28 insertions(+), 14 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/a1874fede74175d4a8e5586c0c53329d16b9aa69


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