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<title>Unable to use multiple CPUs inside an HVM</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You were 100% correct Andrew. The problem
was with how I configured XP, though I seriously thought I knew better. I
sysprepped my image and redid it with the “multi-processor” hal and voila I now
see and utilize both cores. The odd part, however, is that the time required
to complete a processor intensive operation seems to remain almost the same.
Instead of using 50% of the available host CPU it now using 100% but estimates
only a tem minute savings in processing time… Whaaaaat?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I still feel like I’m missing something
rather important, but at least both CPUs are now available for use.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>d<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Andrew Cathrow
[mailto:acathrow@redhat.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, April 20, 2008 11:12
AM<br>
<b><span style='font-weight:bold'>To:</span></b> David Levinger<br>
<b><span style='font-weight:bold'>Cc:</span></b> fedora-xen@redhat.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Fedora-xen] Unable
to use multiple CPUs inside an HVM</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>When Windows installed selects the HAL library appropriate the the
hardware. If you install on a single CPU system then the uniprocessor HAL is
installed.<br>
If you then add a second vcpu to the guest then the windows HAL won't see it. <br>
You'll need to replace Window's hal. See links below for some background. I
don't think there is a Microsoft *supported* way to do this but I've done this
a number of times without issue on XP and 2000, but I've not tried this on
2003, 2008 or <st1:place w:st="on">Vista</st1:place><br>
<br>
<a href="http://support.microsoft.com/kb/309283/en-us">http://support.microsoft.com/kb/309283/en-us</a><br>
<a href="http://support.microsoft.com/default.aspx?scid=kb;EN-US;237556">http://support.microsoft.com/default.aspx?scid=kb;EN-US;237556</a><br>
<br>
<br>
<br>
On Sat, 2008-04-19 at 10:40 -0700, David Levinger wrote:<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 color=black
face="Times New Roman"><span style='font-size:10.0pt;color:black'>Hey Guys,</span></font><br>
<br>
<font size=2 color=black><span style='font-size:10.0pt;color:black'>I have a
fully virtualized XP guest that is set to have 2 VCPUs and in the guest I see 2
CPUs but when it is under heavy load it only utilizes 1 of the physical cores.</span></font><br>
<br>
<font size=2 color=black><span style='font-size:10.0pt;color:black'>Both xm and
virsh show that the guest only has 1 CPU, but my config file and the guest show
it should have 2.</span></font><br>
<br>
<font size=2 color=black><span style='font-size:10.0pt;color:black'>What am I
missing? How can I get this guest to have access to both cores?</span></font><br>
<br>
<font size=2 color=black><span style='font-size:10.0pt;color:black'>Thanks!</span></font><br>
<br>
<font size=2 color=black><span style='font-size:10.0pt;color:black'>David</span></font><o:p></o:p></p>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>--</span></font><o:p></o:p></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>Fedora-xen mailing list</span></font><o:p></o:p></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><a
href="mailto:Fedora-xen@redhat.com">Fedora-xen@redhat.com</a></span></font><o:p></o:p></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><a
href="https://www.redhat.com/mailman/listinfo/fedora-xen">https://www.redhat.com/mailman/listinfo/fedora-xen</a></span></font><o:p></o:p></pre></div>
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