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| author | adrian <adrian@FreeBSD.org> | 2015-04-27 19:18:51 +0000 |
|---|---|---|
| committer | adrian <adrian@FreeBSD.org> | 2015-04-27 19:18:51 +0000 |
| commit | 4f1cf3cec867eca716b65bd33d1ea5007f2bbddc (patch) | |
| tree | d3b0972ae011e66658ba2f923a7223fe2652556e /etc/defaults | |
| parent | 786bb3891ba8d170598e34d1e54467e31cb5014d (diff) | |
| download | FreeBSD-src-4f1cf3cec867eca716b65bd33d1ea5007f2bbddc.zip FreeBSD-src-4f1cf3cec867eca716b65bd33d1ea5007f2bbddc.tar.gz | |
Drop the default for performance_cx_lowest (ie, what to use when AC is connected) to ACPI C2.
ACPI C3 ends up doing a lot more work before entering sleep, some of which
requires grabbing a global ACPI hardware serialising mutex.
Because of this, the more CPU cores you have, the more that lock contends
under load, reaching close to the #1 lock contention (after VM, which is being
worked on.)
Tested:
* Sandy bridge Xeon, 2 socket * 8 core
* Ivy bridge Xeon v2, 2 socket * 8 core
* Westmere-EX, 4 socket * 10 core
* Ivybridge desktop
* Sandybridge mobile
* Ivybridge mobile
MFC after: 2 weeks
Diffstat (limited to 'etc/defaults')
| -rw-r--r-- | etc/defaults/rc.conf | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/etc/defaults/rc.conf b/etc/defaults/rc.conf index 2f5cbca..ef3b861 100644 --- a/etc/defaults/rc.conf +++ b/etc/defaults/rc.conf @@ -648,7 +648,7 @@ devfs_system_ruleset="" # The name (NOT number) of a ruleset to apply to /dev devfs_set_rulesets="" # A list of /mount/dev=ruleset_name settings to # apply (must be mounted already, i.e. fstab(5)) devfs_load_rulesets="YES" # Enable to always load the default rulesets -performance_cx_lowest="Cmax" # Online CPU idle state +performance_cx_lowest="C2" # Online CPU idle state performance_cpu_freq="NONE" # Online CPU frequency economy_cx_lowest="Cmax" # Offline CPU idle state economy_cpu_freq="NONE" # Offline CPU frequency |
