Author: mav
Date: Sat Nov 23 11:46:13 2013
New Revision: 258495
URL: http://svnweb.freebsd.org/changeset/base/258495
Log:
MFreleng/8.4 r251256 (by hrs):
Update description of logical CPU handling in the latest releases and
remove obsolete sysctl variable machdep.hlt_logical_cpus.
MFC after: 3 days
Modified:
head/release/doc/en_US.ISO8859-1/hardware/article.xml
Modified: head/release/doc/en_US.ISO8859-1/hardware/article.xml
==============================================================================
--- head/release/doc/en_US.ISO8859-1/hardware/article.xml Sat Nov 23
03:56:03 2013 (r258494)
+++ head/release/doc/en_US.ISO8859-1/hardware/article.xml Sat Nov 23
11:46:13 2013 (r258495)
@@ -177,16 +177,13 @@
bugs may generate some problems. Perusal of the archives of
the &a.smp; may yield some clues.</para>
- <para>&os; will take advantage of HyperThreading (HTT) support
- on &intel; CPUs that support this feature. The
- default &os; scheduler treats the logical processors the same
- as additional physical processors; in other words, no attempt
- is made to optimize scheduling decisions given the shared
- resources between logical processors within the same CPU.
- Because this naive scheduling can result in suboptimal
- performance, under certain circumstances it may be useful to
- disable the logical processors with the
- <varname>machdep.hyperthreading_allowed</varname> tunable.
+ <para>&os; will take advantage of SMT (Symmetric MultiThreading,
+ also known as HyperThreading on &intel; CPUs) on the supported
+ CPUs. The <filename>GENERIC</filename> kernel which is
+ installed by default will automatically detect the additional
+ logical processors. The default &os; scheduler recognizes
+ processor topology on the system and selects logical and
+ physical processors to obtain optimal performance.
The &man.smp.4; manual page has more details.</para>
<para>&os; will take advantage of Physical Address Extensions
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