<listitem>

<para>

On <productname>NetBSD</productname>,eitheruse the

On <productname>NetBSD</productname>, use either the

<productname>FreeBSD</productname> or

<productname>Linux</productname> start scripts, depending on

preference. <indexterm><primary>NetBSD</><secondary>start script</secondary></>

preference.

<indexterm><primary>NetBSD</><secondary>start script</secondary></>

</para>

</listitem>

</para>

<para>

<systemitem class="osname">FreeBSD</> versions before 4.0 work like

<systemitem class="osname">NetBSD</> and <systemitem class="osname">

OpenBSD</> (see below).

<systemitem class="osname">FreeBSD</> versions before 4.0 work like

<systemitem class="osname">OpenBSD</> (see below).

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><systemitem class="osname">NetBSD</></term>

<term><systemitem class="osname">OpenBSD</></term>

<indexterm><primary>NetBSD</><secondary>IPC configuration</></>

<listitem>

<para>

In <systemitem class="osname">NetBSD</> 5.0 and later,

IPC parameters can be adjusted using <command>sysctl</command>,

for example:

<screen>

<prompt>$</prompt> <userinput>sysctl -w kern.ipc.shmmax=16777216</userinput>

</screen>

To have these settings persist over reboots, modify

<filename>/etc/sysctl.conf</filename>.

</para>

<para>

You might also want to configure your kernel to lock shared

memory into RAM and prevent it from being paged out to swap.

This can be accomplished using the <command>sysctl</command>

setting <literal>kern.ipc.shm_use_phys</literal>.

</para>

<para>

<systemitem class="osname">NetBSD</> versions before 5.0 work like

<systemitem class="osname">OpenBSD</> (see below), except that

parameters should be set with the keyword <literal>options</> not

<literal>option</>.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><systemitem class="osname">OpenBSD</></term>

<indexterm><primary>OpenBSD</><secondary>IPC configuration</></>

<listitem>

<para>

The options <varname>SYSVSHM</> and <varname>SYSVSEM</> need

to be enabled when the kernel is compiled. (They are by

default.) The maximum size of shared memory is determined by

the option <varname>SHMMAXPGS</> (in pages). The following

shows an example of how to set the various parameters

(<systemitem class="osname">OpenBSD</> uses <literal>option</> instead):

shows an example of how to set the various parameters:

<programlisting>

options SYSVSHM

options SHMMAXPGS=4096

options SHMSEG=256

options SYSVSEM

options SEMMNI=256

options SEMMNS=512

options SEMMNU=256

options SEMMAP=256

option SYSVSHM

option SHMMAXPGS=4096

option SHMSEG=256

option SYSVSEM

option SEMMNI=256

option SEMMNS=512

option SEMMNU=256

option SEMMAP=256

</programlisting>

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><systemitem class="osname">HP-UX</></term>

<indexterm><primary>HP-UX</><secondary>IPC configuration</></>