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There are a couple of kinds of <quote>free memory</quote>. The most common is the amount of memory immediately available without reclaiming memory already in use. That is the size of the free pages queue plus some other reserved pages. This amount is exported by the <literal>vm.stats.vm.v_free_count</literal> <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>, shown, for instance, by <citerefentry><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>. Another kind of <quote>free memory</quote> is the total amount of virtual memory available to userland processes, which depends on the sum of swap space and usable memory. Other kinds of <quote>free memory</quote> descriptions are also possible, but it is relatively useless to define these, but rather it is important to make sure that the paging rate is kept low, and to avoid running out of swap space.
What is <filename>/var/empty</filename>?
<filename>/var/empty</filename> is a directory that the <citerefentry><refentrytitle>sshd</refentrytitle><manvolnum>8</manvolnum></citerefentry> program uses when performing privilege separation. The <filename>/var/empty</filename> directory is empty, owned by <systemitem class="username">root</systemitem> and has the <literal>schg</literal> flag set. This directory should not be deleted.
I just changed <filename>/etc/newsyslog.conf</filename>. How can I check if it does what I expect?
To see what <citerefentry><refentrytitle>newsyslog</refentrytitle><manvolnum>8</manvolnum></citerefentry> will do, use the following:
<prompt>%</prompt> <userinput>newsyslog -nrvv</userinput>
My time is wrong, how can I change the timezone?
Use <citerefentry><refentrytitle>tzsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
The X Window System and Virtual Consoles
What is the X Window System?
The X Window System (commonly <literal>X11</literal>) is the most widely available windowing system capable of running on <trademark class="registered">UNIX</trademark> or <trademark class="registered">UNIX</trademark> like systems, including FreeBSD. <link xlink:href="http://www.x.org/wiki/">The X.Org Foundation</link> administers the <link xlink:href="http://en.wikipedia.org/wiki/X_Window_System_core_protocol">X protocol standards</link>, with the current reference implementation, version 11 release 7.7, so references are often shortened to <literal>X11</literal>.
Many implementations are available for different architectures and operating systems. An implementation of the server-side code is properly known as an <literal>X server</literal>.
I want to run Xorg, how do I go about it?
To install Xorg do one of the following:
Use the <package>x11/xorg</package> meta-port, which builds and installs every Xorg component.
Use <package>x11/xorg-minimal</package>, which builds and installs only the necessary Xorg components.
Install Xorg from FreeBSD packages:
<userinput><prompt>#</prompt> pkg install xorg</userinput>
After the installation of Xorg, follow the instructions from the <link xlink:href="@@URL_RELPREFIX@@/doc/en_US.ISO8859-1/books/handbook/x-config.html">X11 Configuration</link> section of the FreeBSD Handbook.
I <emphasis>tried</emphasis> to run X, but I get a <errorname>No devices detected.</errorname> error when I type <command>startx</command>. What do I do now?
The system is probably running at a raised <literal>securelevel</literal>. It is not possible to start X at a raised <literal>securelevel</literal> because X requires write access to <citerefentry><refentrytitle>io</refentrytitle><manvolnum>4</manvolnum></citerefentry>. For more information, see at the <citerefentry><refentrytitle>init</refentrytitle><manvolnum>8</manvolnum></citerefentry> manual page.
There are two solutions to the problem: set the <literal>securelevel</literal> back down to zero or run <citerefentry vendor="xfree86"><refentrytitle>xdm</refentrytitle><manvolnum>1</manvolnum></citerefentry> (or an alternative display manager) at boot time before the <literal>securelevel</literal> is raised.
See <xref linkend="xdm-boot"/> for more information about running <citerefentry vendor="xfree86"><refentrytitle>xdm</refentrytitle><manvolnum>1</manvolnum></citerefentry> at boot time.
Why does my mouse not work with X?
When using <citerefentry><refentrytitle>vt</refentrytitle><manvolnum>4</manvolnum></citerefentry>, the default console driver, FreeBSD can be configured to support a mouse pointer on each virtual screen. To avoid conflicting with X, <citerefentry><refentrytitle>vt</refentrytitle><manvolnum>4</manvolnum></citerefentry> supports a virtual device called <filename>/dev/sysmouse</filename>. All mouse events received from the real mouse device are written to the <citerefentry><refentrytitle>sysmouse</refentrytitle><manvolnum>4</manvolnum></citerefentry> device via <citerefentry><refentrytitle>moused</refentrytitle><manvolnum>8</manvolnum></citerefentry>. To use the mouse on one or more virtual consoles, <emphasis>and</emphasis> use X, see <xref linkend="moused" remap="another section"/> and set up <citerefentry><refentrytitle>moused</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
Then edit <filename>/etc/X11/xorg.conf</filename> and make sure the following lines exist:
Section "InputDevice"
Option "Protocol" "SysMouse"
Option "Device" "/dev/sysmouse"
.....
Starting with Xorg version 7.4, the <literal>InputDevice</literal> sections in <filename>xorg.conf</filename> are ignored in favor of autodetected devices. To restore the old behavior, add the following line to the <literal>ServerLayout</literal> or <literal>ServerFlags</literal> section:
Option "AutoAddDevices" "false"
Some people prefer to use <filename>/dev/mouse</filename> under X. To make this work, <filename>/dev/mouse</filename> should be linked to <filename>/dev/sysmouse</filename> (see <citerefentry><refentrytitle>sysmouse</refentrytitle><manvolnum>4</manvolnum></citerefentry>) by adding the following line to <filename>/etc/devfs.conf</filename> (see <citerefentry><refentrytitle>devfs.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>):
link sysmouse mouse

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Source string comment
(itstool) path: answer/para
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read-only
Source string location
book.translate.xml:4103
String age
a year ago
Source string age
a year ago
Translation file
books/faq.pot, string 653