| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="settings-acceleration">
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| 4 | <title>Acceleration Tab</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>On this tab, you can configure <ph conkeyref="vbox-conkeyref-phrases/product-name"/> to use hardware virtualization extensions that your host CPU supports. </p>
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| 8 | <ul>
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| 9 | <li>
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| 10 | <p><b outputclass="bold">Paravirtualization Interface:</b>
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| 11 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> provides paravirtualization interfaces to improve time-keeping accuracy and performance of guest OSes. The options available are documented under the <codeph>--paravirt-provider</codeph> option in <xref href="vboxmanage.dita"/>
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| 12 | <cmdname>modifyvm</cmdname>. For further details on the paravirtualization providers, see <xref href="gimproviders.dita">Paravirtualization Providers</xref>. </p>
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| 13 | </li>
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| 14 | <li>
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| 15 | <p><b outputclass="bold">Hardware Virtualization:</b>
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| 16 | You can configure hardware virtualization features for each
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| 17 | virtual machine.
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| 18 | </p>
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| 19 | <ul>
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| 20 | <li>
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| 21 | <p><b outputclass="bold">Enable Nested Paging:</b>
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| 22 | If the host CPU supports the nested paging (AMD-V) or
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| 23 | EPT (Intel VT-x) features, then you can expect a
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| 24 | significant performance increase by enabling nested
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| 25 | paging in addition to hardware virtualization. For
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| 26 | technical details, see <xref href="nestedpaging.dita">Nested Paging and VPIDs</xref>.
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| 27 | For Intel EPT security recommendations, see
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| 28 | <xref href="sec-rec-cve-2018-3646.dita">CVE-2018-3646</xref>.
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| 29 | </p>
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| 30 | </li>
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| 31 | </ul>
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| 32 | <p>Advanced users may be interested in technical details about hardware virtualization. See <xref
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| 33 | href="hwvirt.dita">Hardware Virtualization</xref>. </p>
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| 34 | </li>
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| 35 | </ul>
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| 36 | <p>In most cases, the default settings on the <b outputclass="bold">Acceleration</b> tab will work well. <ph conkeyref="vbox-conkeyref-phrases/product-name"/> selects sensible defaults, depending on the OS that you selected when you created the virtual machine. In certain situations, however, you may want to change the preconfigured defaults. </p>
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| 37 | </body>
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| 38 |
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| 39 | </topic>
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