Add a paragraph on HyperThreading support.

1 files changed, 9 insertions, 0 deletions

diff --git a/release/doc/en_US.ISO8859-1/hardware/i386/proc-i386.sgml b/release/doc/en_US.ISO8859-1/hardware/i386/proc-i386.sgml
index f073b68..2b6780b 100644
--- a/release/doc/en_US.ISO8859-1/hardware/i386/proc-i386.sgml
+++ b/release/doc/en_US.ISO8859-1/hardware/i386/proc-i386.sgml
@@ -34,6 +34,15 @@
   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
+    CPUs that support this feature.  A kernel with the
+    <literal>SMP</literal> feature enabled will detect and start the
+    additional logical processors.  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.</para>
+
   <para>&os; will generally run on i386-based laptops, albeit with
   varying levels of support for certain hardware features such as
   sound, graphics, power management, and PCCARD expansion slots.