VirtualBox

source: vbox/trunk/doc/manual/en_US/dita/topics/changetscmode.dita@ 104688

最後變更 在這個檔案從104688是 99797,由 vboxsync 提交於 22 月 前

Docs: bugref:10302. Merging changes from the docs team. Almost exclusively conkeyref related stuff.

  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Author Date Id Revision
檔案大小: 1.7 KB
 
1<?xml version='1.0' encoding='UTF-8'?>
2<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
3<topic xml:lang="en-us" id="changetscmode">
4 <title>Configuring the Guest Time Stamp Counter (TSC) to Reflect Guest
5 Execution</title>
6
7 <body>
8 <p>
9 By default, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> keeps all sources of time visible to
10 the guest synchronized to a single time source, the monotonic
11 host time. This reflects the assumptions of many guest operating
12 systems, which expect all time sources to reflect "wall clock"
13 time. In special circumstances it may be useful however to make
14 the time stamp counter (TSC) in the guest reflect the time
15 actually spent executing the guest.
16 </p>
17 <p>
18 This special TSC handling mode can be enabled on a per-VM basis,
19 and for best results must be used only in combination with
20 hardware virtualization. To enable this mode use the following
21 command:
22 </p>
23 <pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal/TM/TSCTiedToExecution" 1</pre>
24 <p>
25 To revert to the default TSC handling mode use:
26 </p>
27 <pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal/TM/TSCTiedToExecution"</pre>
28 <p>
29 Note that if you use the special TSC handling mode with a guest
30 operating system which is very strict about the consistency of
31 time sources you may get a warning or error message about the
32 timing inconsistency. It may also cause clocks to become
33 unreliable with some guest operating systems depending on how
34 they use the TSC.
35 </p>
36 </body>
37
38</topic>
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