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<arrakis@tsiom.com>
2017-Mar-21 14:55 UTC
Re: [libvirt-users] CPU Pinning Help

<html><body><span style="font-family:Verdana; color:#000;
font-size:10pt;"><span style="font-family:Verdana; color:#000;
font-size:10pt;"><div style="font-family: verdana, geneva;
color: rgb(0, 0, 0); font-size: 10pt;" mce_style="color: #000000;
font-family: verdana, geneva; font-size: 10pt;">Thanks for the reply,
this is the output</div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva"
style=""></font></div><div style="font-family:
verdana, geneva;"><font face="verdana,
geneva"></font></div><div style="font-family:
verdana, geneva;"><font face="verdana,
geneva"><br></font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">Machine (31GB)</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">&nbsp; Package L#0 + L3 L#0
(15MB)</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core
L#0</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; &nbsp; PU L#0 (P#0)</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">&nbsp; &nbsp; &nbsp; PU L#1
(P#6)</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; L2 L#1 (256KB) + L1d L#1 (32KB) + L1i L#1 (32KB) + Core
L#1</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; &nbsp; PU L#2 (P#1)</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">&nbsp; &nbsp; &nbsp; PU L#3
(P#7)</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; L2 L#2 (256KB) + L1d L#2 (32KB) + L1i L#2 (32KB) + Core
L#2</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; &nbsp; PU L#4 (P#2)</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">&nbsp; &nbsp; &nbsp; PU L#5
(P#8)</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; L2 L#3 (256KB) + L1d L#3 (32KB) + L1i L#3 (32KB) + Core
L#3</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; &nbsp; PU L#6 (P#3)</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">&nbsp; &nbsp; &nbsp; PU L#7
(P#9)</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; L2 L#4 (256KB) + L1d L#4 (32KB) + L1i L#4 (32KB) + Core
L#4</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; &nbsp; PU L#8 (P#4)</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">&nbsp; &nbsp; &nbsp; PU L#9
(P#10)</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; L2 L#5 (256KB) + L1d L#5 (32KB) + L1i L#5 (32KB) + Core
L#5</font></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">&nbsp;
&nbsp; &nbsp; PU L#10 (P#5)</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">&nbsp; &nbsp; &nbsp; PU L#11
(P#11)</font></div><div style="font-family: verdana,
geneva;"><br></div><div style="font-family: verdana,
geneva;"><font face="verdana, geneva">At the moment I
have the following in my Domain XML, to pin the first physical 3 cores to
corresponding virtual cores. My question though, is how do I know which vcpus
are siblings for a given topology specified in
&lt;cpu&gt;&lt;topology&gt;...</font><span>&lt;/cpu&gt;&lt;/topology&gt;?</span></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva"><br></font><span style="font-family:
Verdana, Arial, Helvetica, sans-serif; font-size: 9pt;"
mce_style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size:
9pt;"></span></div><div><span
style="font-size: 9pt;" mce_style="font-size:
9pt;"><span style="font-size: 10pt;"
mce_style="font-size: 10pt;">&lt;vcpu
placement='static'
cpuset="1-6"&gt;6&lt;/vcpu&gt;</span></span></div><div><span
style="font-size: 10pt;" mce_style="font-size:
10pt;"><br></span></div><div><span
style="font-size: 9pt;" mce_style="font-size:
9pt;"><span style="font-size: 10pt;"
mce_style="font-size:
10pt;">&lt;cputune&gt;</span></span></div><div><span
style="font-size: 10pt;" mce_style="font-size:
10pt;">&nbsp; &nbsp; &lt;vcpupin vcpu="0"
cpuset="0"/&gt;</span></div><div><span
style="font-size: 10pt;" mce_style="font-size:
10pt;">&nbsp; &nbsp; &lt;vcpupin vcpu="1"
cpuset="6"/&gt;</span></div><div><div><span
mce_style="font-size: 10pt;">&nbsp; &nbsp; &lt;vcpupin
vcpu="2"
cpuset="1"/&gt;</span></div><div><span
mce_style="font-size: 10pt;">&nbsp; &nbsp; &lt;vcpupin
vcpu="3"
cpuset="7"/&gt;</span></div></div><div><span
style="font-size: 10pt;" mce_style="font-size:
10pt;">&nbsp; &nbsp; &lt;vcpupin vcpu="4"
cpuset="2"/&gt;</span></div><div><span
style="font-size: 10pt;" mce_style="font-size:
10pt;"><span style="">&nbsp; &nbsp;
&lt;vcpupin vcpu="5"
cpuset="8"/&gt;</span></span></div><div><span
style="font-size: 10pt;" mce_style="font-size:
10pt;">&lt;/cputune&gt;</span></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva"><br></font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva">Thanks for the help!</font></div><div
style="font-family: verdana, geneva;"><font face="verdana,
geneva"><br></font> <div
id="wmQuoteWrapper"> -------- Original Message --------<br>
Subject: Re: [libvirt-users] CPU Pinning Help<br> From: Ram Krishna
&lt;<a target="_blank"
href="mailto:krishna.ubuntu@gmail.com"
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return false;">krishna.ubuntu@gmail.com</a>&gt;<br>
Date: Tue, March 21, 2017 1:13 am<br> To: <a target="_blank"
href="mailto:arrakis@tsiom.com"
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return false;">arrakis@tsiom.com</a><br> Cc: <a
target="_blank" href="mailto:libvirt-users@redhat.com"
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can you try lstopo command<div class=""><br
class=""><div><blockquote type="cite"
class=""><div class="">On Mar 19, 2017, at 9:54 PM,
&lt;<a target="_blank"
href="mailto:arrakis@tsiom.com"
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return false;" class="">arrakis@tsiom.com</a>&gt;
&lt;<a target="_blank"
href="mailto:arrakis@tsiom.com"
mce_onclick="if(window.location==top.location){Popup.composeWindow('pcompose.php?sendto=arrakis%40tsiom.com');}else{top.Popup.composeWindow('pcompose.php?sendto=arrakis%40tsiom.com');};
return false;" class="">arrakis@tsiom.com</a>&gt;
wrote:</div><br class="Apple-interchange-newline"><div
class=""><div class=""><span
style="font-family: Verdana; font-size: 10pt;"
mce_style="font-family: Verdana; font-size: 10pt;"
class=""><div class="colourline linestyle2">Hello,
I was hoping&nbsp;<span style="font-size: 10pt;"
mce_style="font-size: 10pt;" class="">someone help me
regarding my KVM Domain XML file. I have a 1 socket, 6 core processor with
hyperthreading. I wanted to pin 3 full cores (6 threads on 3 cores) to my KVM
instance with a 1-1 mapping (so that the KVM instance has 3 cores and 6 total
threads). I thus used the following in my xml
file:</span></div><div class="linestyle1
colourline"><br class=""></div>&lt;cpu
mode='host-model&gt; &lt;topology sockets='1'
cores='3' threads='2'/&gt; &lt;/cpu&gt;<div
class="linestyle1 colourline"><br
class=""></div><div class="linestyle1
colourline"><span style="font-size: 10pt;"
mce_style="font-size: 10pt;" class="">I know what
physical cpu ids are siblings (share the same processor cores) through $(cat
/proc/cpu) or $(</span>virsh capabilities). &nbsp;<span
style="font-size: 10pt;" mce_style="font-size: 10pt;"
class="">However, in the &lt;cputune&gt; section, when
pinning vcpus ids to physical cpus, I need to know which vcpu ids are
"siblings" (which vcpu ids share the same virtual core). I would
imagine vcpu ids 0 &amp; 1 are siblings, 2 &amp; 3 are siblings etc, but
I cannot find anywhere in the documentation which confirms
this.</span></div><div class="linestyle1
colourline"><br class=""></div><div
class="linestyle1 colourline"><span style="font-size:
10pt;" mce_style="font-size: 10pt;" class="">Could
someone please help?<br class="">Many
thanks!&nbsp;</span></div><div class="linestyle1
colourline"><span style="font-size: 10pt;"
mce_style="font-size: 10pt;" class=""><br
class=""></span></div><div class="linestyle1
colourline"><br
class=""></div></span></div>
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mce_href="https://www.redhat.com/mailman/listinfo/libvirt-users">https://www.redhat.com/mailman/listinfo/libvirt-users</a></div></blockquote></div><br
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