Date: Wed, 15 Jan 2014 18:48:34 +0000 (UTC) From: Hiroki Sato <hrs@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r260693 - stable/10/release/doc/en_US.ISO8859-1/errata Message-ID: <201401151848.s0FImY1O070259@svn.freebsd.org>
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Author: hrs Date: Wed Jan 15 18:48:34 2014 New Revision: 260693 URL: http://svnweb.freebsd.org/changeset/base/260693 Log: Document an issue of FreeBSD/i386 on VirtualBox. Discussed with: glebius and delphij Modified: stable/10/release/doc/en_US.ISO8859-1/errata/article.xml Modified: stable/10/release/doc/en_US.ISO8859-1/errata/article.xml ============================================================================== --- stable/10/release/doc/en_US.ISO8859-1/errata/article.xml Wed Jan 15 17:51:49 2014 (r260692) +++ stable/10/release/doc/en_US.ISO8859-1/errata/article.xml Wed Jan 15 18:48:34 2014 (r260693) @@ -143,7 +143,32 @@ <sect1 xml:id="open-issues"> <title>Open Issues</title> - <para>No open issues.</para> + <itemizedlist> + <listitem> + <para>&os;/&arch.i386; &release.prev; running as a guest + operating system on <application>VirtualBox</application> + can have a problem with disk I/O access. It depends on some + specific hardware configuration and does not depend on a + specific version of <application>VitrualBox</application> or + host operating system.</para> + + <para>It causes various errors and makes &os; quite unstable. + Although the cause is still unclear, disabling unmapped I/O + works as a workaround. To disable it, choose <literal>Escape to + loader prompt</literal> in the boot menu and enter the following + lines from &man.loader.8; prompt, after + an <literal>OK</literal>:</para> + + <screen>set vfs.unmapped_buf_allowed=0 +boot</screen> + + <para>Note that the following line has to be added to + <filename>/boot/loader.conf</filename> after a boot. + It disables unmapped I/O at every boot:</para> + + <programlisting>vfs.unmapped_buf_allowed=0</programlisting> + </listitem> + </itemizedlist> </sect1> <sect1 xml:id="late-news">
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