Date: Sun, 13 Jan 2013 05:52:35 +0000 (UTC) From: Eitan Adler <eadler@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r40595 - head/en_US.ISO8859-1/books/faq Message-ID: <201301130552.r0D5qZCF025430@svn.freebsd.org>
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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
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