svn commit: r40595 - head/en_US.ISO8859-1/books/faq

[Eitan Adler]

Author: eadler
Date: Sun Jan 13 05:52:35 2013
New Revision: 40595
URL: http://svnweb.freebsd.org/changeset/doc/40595

Log:
  Don't compare swap usage to Linux: it isn't known if this comparison is
  still true.
  
  Expand a bit on what &os; might do with the extra memory.
  
  Approved by:	bcr (mentor)

Modified:
  head/en_US.ISO8859-1/books/faq/book.xml

Modified: head/en_US.ISO8859-1/books/faq/book.xml
==============================================================================
--- head/en_US.ISO8859-1/books/faq/book.xml	Sun Jan 13 05:48:42 2013	(r40594)
+++ head/en_US.ISO8859-1/books/faq/book.xml	Sun Jan 13 05:52:35 2013	(r40595)
@@ -7960,18 +7960,16 @@ hint.sio.7.irq="12"</programlisting>
     <qandaset>
       <qandaentry>
 	<question id="more-swap">
-	  <para>&os; uses far more swap space than &linux;.  Why?</para>
+	  <para>&os; a lot of swap space even when the computer has
+	    free memory left.  Why?</para>
 	</question>
 
 	<answer>
-	  <para>&os; only appears to use more swap than &linux;.  In
-	    actual fact, it does not.  The main difference between &os;
-	    and &linux; in this regard is that &os; will proactively
+	  <para>&os; will proactively
 	    move entirely idle, unused pages of main memory into swap in
 	    order to make more main memory available for active use.
-	    &linux; tends to only move pages to swap as a last resort.
-	    The perceived heavier use of swap is balanced by the more
-	    efficient use of main memory.</para>
+	    This heavy use of swap is balanced by using the extra free
+	    memory for cacheing.</para>
 
 	  <para>Note that while &os; is proactive in this regard, it
 	    does not arbitrarily decide to swap pages when the system is