<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.E-mailStijl17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:1616792062;
mso-list-type:hybrid;
mso-list-template-ids:-758879904 135462927 135462937 135462939 135462927 135462937 135462939 135462927 135462937 135462939;}
@list l0:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level3
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level4
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level5
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level6
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level7
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level8
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level9
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="NL-BE" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Qemu can work with vmdk but some features of vmdk aren’t used. So I can understand vmdk is slow.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best practice:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Use LVM is you can (harder to transfer/copy images)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alternative raw-file for speed (but you lose functionalities)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Qcow for functionality in a file image (snapshots, compression,…)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I think other formats are supported for compatibility reasons in testing and migration scenarios, not for production environments.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="NL" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Van:</span></b><span lang="NL" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> libvirt-users-bounces@redhat.com [mailto:libvirt-users-bounces@redhat.com]
<b>Namens </b>John Obaterspok<br>
<b>Verzonden:</b> vrijdag 19 februari 2016 7:16<br>
<b>Aan:</b> Martin Kletzander<br>
<b>CC:</b> libvirt-users@redhat.com<br>
<b>Onderwerp:</b> Re: [libvirt-users] Sluggish performance with virtio and Win10<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">2016-02-18 15:15 GMT+01:00 Martin Kletzander <<a href="mailto:mkletzan@redhat.com" target="_blank">mkletzan@redhat.com</a>>:<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">On Thu, Feb 18, 2016 at 12:59:52PM +0100, John Obaterspok wrote:<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">2016-02-18 11:25 GMT+01:00 Martin Kletzander <<a href="mailto:mkletzan@redhat.com" target="_blank">mkletzan@redhat.com</a>>:<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">On Thu, Feb 18, 2016 at 10:41:42AM +0100, John Obaterspok wrote:<o:p></o:p></p>
<p class="MsoNormal">2016-02-18 10:13 GMT+01:00 Martin Kletzander <<a href="mailto:mkletzan@redhat.com" target="_blank">mkletzan@redhat.com</a>>:<br>
<br>
On Thu, Feb 18, 2016 at 08:49:38AM +0100, John Obaterspok wrote:<o:p></o:p></p>
<p class="MsoNormal"><br>
Hello,<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
I'm using virt-manager on my F23 box to run a Windows 10 image but the<br>
performance is so bad it's killing me.<br>
<br>
I have "vmx" flag in /proc/cpuinfo<br>
<br>
# lsmod |grep kvm<br>
kvm_intel 167936 6<br>
kvm 503808 1 kvm_intel<br>
<br>
virtio-win-0.1.112-1.noarch<br>
<br>
But no virtio modules loaded. Should they be loaded nowadays?<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Not on the host AFAIK.<br>
<br>
The disk format used is vmdk with no caching and native mode.<o:p></o:p></p>
<p class="MsoNormal">The io is 100% in windows task manager performing less than 1MB/s<br>
<br>
Any clues?<br>
<br>
<br>
What are the figures from the host? What is qemu doing and what are the<o:p></o:p></p>
<p class="MsoNormal">other processes and devices doing?<br>
<br>
<br>
What is the best way to find this out?<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">{,a,h}top should do for the initial runs, just to see if the block layer<br>
is busy or the CPU is busy or something else is blocking it<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">atop seems to indicate that sdd is busy?<br>
<br>
DSK | sdd | busy 96% | | read 1455 | write<br>
1319 | KiB/r 5 | KiB/w 9 | | MBr/s 0.74 | MBw/s<br>
1.26 | avq 1.01 | | avio 3.43 ms |<br>
<br>
# mount | grep sdd<br>
/dev/sdd2 on /vm type ext4 (rw,relatime,seclabel,data=ordered)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<p class="MsoNormal">And it doesn't do that in any other process on the host? It looks like<br>
it's not related to virtualisation...<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.5pt">Hi,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
</div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:9.5pt">I changed from vmdk to raw and the Write performance went from 1.6 MB/s to ~100 MB/s<o:p></o:p></span></p>
</div>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.5pt">Is vmdk write performance so bad?</span> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Result:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><a href="http://postimg.org/image/gcqe5affn/">http://postimg.org/image/gcqe5affn/</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">-- john<o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>