libvirt users - Apr 2015 - Re: VM Performance using KVM Vs. VMware ESXi

On 4/14/2015 4:58 PM, Daniel P. Berrange wrote:
> On Tue, Apr 14, 2015 at 04:53:52PM +0530, Jatin Davey wrote:
>> On 4/14/2015 4:42 PM, Dominique Ramaekers wrote:
>>> About Spice: I think it’s good practice to use spice because it
improves
>>> the performance of the VM in general by improving screen
performance. If
>>> your VM is constantly displaying output, you’ll probably will
notice a
>>> difference.
>>>
>> [Jatin] Ok, This is not my concern as of now. I will take a look at it
>> sometime later.
>>> About virtio: You can see it in the settings. Better yet, it’s in
your
>>> XML. If you post your XML, we can take a look…
>>>
>> Here is the xml associated with my VM:
>>
>> ********************************
>> <domain type='kvm'>
>>    <devices>
>>      <emulator>/usr/libexec/qemu-kvm</emulator>
>>      <disk type='file' device='disk'>
>>        <driver name='qemu' type='qcow2'
cache='none'/>
>>        <source
file='/var/lib/libvirt/images/****.qcow2'/>
>>        <target dev='hda' bus='ide'/>
>>        <address type='drive' controller='0'
bus='0' target='0' unit='0'/>
>>      </disk>
> This disk is configured to use IDE, so performance of anything that does
> disk I/O is going to be terrible. You really want to be using virtio.
>
>>     <interface type='bridge'>
>>       <mac address='52:54:00:c9:58:c9'/>
>>       <source bridge='br332'/>
>>       <address type='pci' domain='0x0000'
bus='0x00' slot='0x03' function='0x0'/>
>>      </interface>
> This doesn't have any model listed at all, so it will be falling back
to
> a generic emulated NIC. Again performance of this is likely going to be
> terrible for anything doing network I/O. You want to be using virtio for
> this too.
>
> Regards,
> Daniel
How do i make use of virtio for the both disk and network that you have 
mentioned above ?
Any pointers to it would be helpful.

Thanks
Jatin

Please read: https://libvirt.org/formatdomain.html


-----Oorspronkelijk bericht-----
Van: Jatin Davey [mailto:jashokda@cisco.com] 
Verzonden: dinsdag 14 april 2015 13:39
Aan: Daniel P. Berrange
CC: Dominique Ramaekers; libvirt-users@redhat.com
Onderwerp: Re: [libvirt-users] VM Performance using KVM Vs. VMware ESXi

On 4/14/2015 4:58 PM, Daniel P. Berrange wrote:
> On Tue, Apr 14, 2015 at 04:53:52PM +0530, Jatin Davey wrote:
>> On 4/14/2015 4:42 PM, Dominique Ramaekers wrote:
>>> About Spice: I think it’s good practice to use spice because it 
>>> improves the performance of the VM in general by improving screen 
>>> performance. If your VM is constantly displaying output, you’ll 
>>> probably will notice a difference.
>>>
>> [Jatin] Ok, This is not my concern as of now. I will take a look at 
>> it sometime later.
>>> About virtio: You can see it in the settings. Better yet, it’s in 
>>> your XML. If you post your XML, we can take a look…
>>>
>> Here is the xml associated with my VM:
>>
>> ********************************
>> <domain type='kvm'>
>>    <devices>
>>      <emulator>/usr/libexec/qemu-kvm</emulator>
>>      <disk type='file' device='disk'>
>>        <driver name='qemu' type='qcow2'
cache='none'/>
>>        <source
file='/var/lib/libvirt/images/****.qcow2'/>
>>        <target dev='hda' bus='ide'/>
>>        <address type='drive' controller='0'
bus='0' target='0' unit='0'/>
>>      </disk>
> This disk is configured to use IDE, so performance of anything that 
> does disk I/O is going to be terrible. You really want to be using virtio.
>
>>     <interface type='bridge'>
>>       <mac address='52:54:00:c9:58:c9'/>
>>       <source bridge='br332'/>
>>       <address type='pci' domain='0x0000'
bus='0x00' slot='0x03' function='0x0'/>
>>      </interface>
> This doesn't have any model listed at all, so it will be falling back 
> to a generic emulated NIC. Again performance of this is likely going 
> to be terrible for anything doing network I/O. You want to be using 
> virtio for this too.
>
> Regards,
> Daniel
How do i make use of virtio for the both disk and network that you have
mentioned above ?
Any pointers to it would be helpful.

Thanks
Jatin

Thanks Dominique & Daniel.

Looks like i need to upgrade my VMs kernel to make it aware of virtio.

Found this information from this link:

http://wiki.libvirt.org/page/Virtio#Disk_.28block.29_device_driver

I tried without upgrading the Kernel and as soon as i start my VM it got 
into Kernel Panic. I will try using virtio after upgrading my VMs kernel.

Thanks for all the responses and pointers.

Thanks
Jatin

On 4/14/2015 5:08 PM, Dominique Ramaekers wrote:
> Please read: https://libvirt.org/formatdomain.html
>
>
> -----Oorspronkelijk bericht-----
> Van: Jatin Davey [mailto:jashokda@cisco.com]
> Verzonden: dinsdag 14 april 2015 13:39
> Aan: Daniel P. Berrange
> CC: Dominique Ramaekers; libvirt-users@redhat.com
> Onderwerp: Re: [libvirt-users] VM Performance using KVM Vs. VMware ESXi
>
> On 4/14/2015 4:58 PM, Daniel P. Berrange wrote:
>> On Tue, Apr 14, 2015 at 04:53:52PM +0530, Jatin Davey wrote:
>>> On 4/14/2015 4:42 PM, Dominique Ramaekers wrote:
>>>> About Spice: I think it’s good practice to use spice because it
>>>> improves the performance of the VM in general by improving
screen
>>>> performance. If your VM is constantly displaying output, you’ll
>>>> probably will notice a difference.
>>>>
>>> [Jatin] Ok, This is not my concern as of now. I will take a look at
>>> it sometime later.
>>>> About virtio: You can see it in the settings. Better yet, it’s
in
>>>> your XML. If you post your XML, we can take a look…
>>>>
>>> Here is the xml associated with my VM:
>>>
>>> ********************************
>>> <domain type='kvm'>
>>>     <devices>
>>>       <emulator>/usr/libexec/qemu-kvm</emulator>
>>>       <disk type='file' device='disk'>
>>>         <driver name='qemu' type='qcow2'
cache='none'/>
>>>         <source
file='/var/lib/libvirt/images/****.qcow2'/>
>>>         <target dev='hda' bus='ide'/>
>>>         <address type='drive' controller='0'
bus='0' target='0' unit='0'/>
>>>       </disk>
>> This disk is configured to use IDE, so performance of anything that
>> does disk I/O is going to be terrible. You really want to be using
virtio.
>>
>>>      <interface type='bridge'>
>>>        <mac address='52:54:00:c9:58:c9'/>
>>>        <source bridge='br332'/>
>>>        <address type='pci' domain='0x0000'
bus='0x00' slot='0x03' function='0x0'/>
>>>       </interface>
>> This doesn't have any model listed at all, so it will be falling
back
>> to a generic emulated NIC. Again performance of this is likely going
>> to be terrible for anything doing network I/O. You want to be using
>> virtio for this too.
>>
>> Regards,
>> Daniel
> How do i make use of virtio for the both disk and network that you have
mentioned above ?
> Any pointers to it would be helpful.
>
> Thanks
> Jatin

--------------080300030508050503090808
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: 8bit

<html>
  <head>
    <meta content="text/html; charset=utf-8"
http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <font face="Times New Roman">Thanks Dominique &amp;
Daniel.<br>
      <br>
      Looks like i need to upgrade my VMs kernel to make it aware of
      virtio.<br>
      <br>
      Found this information from this link:<br>
      <br>
      <a class="moz-txt-link-freetext"
href="http://wiki.libvirt.org/page/Virtio#Disk_.28block.29_device_driver">http://wiki.libvirt.org/page/Virtio#Disk_.28block.29_device_driver</a><br>
      <br>
      I tried without upgrading the Kernel and as soon as i start my VM
      it got into Kernel Panic. I will try using virtio after upgrading
      my VMs kernel.<br>
      <br>
      Thanks for all the responses and pointers.<br>
      <br>
      Thanks<br>
      Jatin<br>
    </font><br>
    <div class="moz-cite-prefix">On 4/14/2015 5:08 PM, Dominique
      Ramaekers wrote:<br>
    </div>
    <blockquote
     
cite="mid:5CFBD7F4A5E6214CAAA69C03E2E1CD195451BB4E04@cmsrv5.cometal.be"
      type="cite">
      <pre wrap="">Please read: <a
class="moz-txt-link-freetext"
href="https://libvirt.org/formatdomain.html">https://libvirt.org/formatdomain.html</a>


-----Oorspronkelijk bericht-----
Van: Jatin Davey [<a class="moz-txt-link-freetext"
href="mailto:jashokda@cisco.com">mailto:jashokda@cisco.com</a>]
Verzonden: dinsdag 14 april 2015 13:39
Aan: Daniel P. Berrange
CC: Dominique Ramaekers; <a class="moz-txt-link-abbreviated"
href="mailto:libvirt-users@redhat.com">libvirt-users@redhat.com</a>
Onderwerp: Re: [libvirt-users] VM Performance using KVM Vs. VMware ESXi

On 4/14/2015 4:58 PM, Daniel P. Berrange wrote:
</pre>
      <blockquote type="cite">
        <pre wrap="">On Tue, Apr 14, 2015 at 04:53:52PM +0530,
Jatin Davey wrote:
</pre>
        <blockquote type="cite">
          <pre wrap="">On 4/14/2015 4:42 PM, Dominique Ramaekers
wrote:
</pre>
          <blockquote type="cite">
            <pre wrap="">About Spice: I think it’s good practice
to use spice because it
improves the performance of the VM in general by improving screen 
performance. If your VM is constantly displaying output, you’ll 
probably will notice a difference.

</pre>
          </blockquote>
          <pre wrap="">[Jatin] Ok, This is not my concern as of
now. I will take a look at
it sometime later.
</pre>
          <blockquote type="cite">
            <pre wrap="">About virtio: You can see it in the
settings. Better yet, it’s in
your XML. If you post your XML, we can take a look…

</pre>
          </blockquote>
          <pre wrap="">Here is the xml associated with my VM:

********************************
&lt;domain type='kvm'&gt;
   &lt;devices&gt;
     &lt;emulator&gt;/usr/libexec/qemu-kvm&lt;/emulator&gt;
     &lt;disk type='file' device='disk'&gt;
       &lt;driver name='qemu' type='qcow2'
cache='none'/&gt;
       &lt;source file='/var/lib/libvirt/images/****.qcow2'/&gt;
       &lt;target dev='hda' bus='ide'/&gt;
       &lt;address type='drive' controller='0'
bus='0' target='0' unit='0'/&gt;
     &lt;/disk&gt;
</pre>
        </blockquote>
        <pre wrap="">This disk is configured to use IDE, so
performance of anything that
does disk I/O is going to be terrible. You really want to be using virtio.

</pre>
        <blockquote type="cite">
          <pre wrap="">    &lt;interface
type='bridge'&gt;
      &lt;mac address='52:54:00:c9:58:c9'/&gt;
      &lt;source bridge='br332'/&gt;
      &lt;address type='pci' domain='0x0000'
bus='0x00' slot='0x03' function='0x0'/&gt;
     &lt;/interface&gt;
</pre>
        </blockquote>
        <pre wrap="">This doesn't have any model listed at
all, so it will be falling back
to a generic emulated NIC. Again performance of this is likely going 
to be terrible for anything doing network I/O. You want to be using 
virtio for this too.

Regards,
Daniel
</pre>
      </blockquote>
      <pre wrap="">How do i make use of virtio for the both disk
and network that you have mentioned above ?
Any pointers to it would be helpful.

Thanks
Jatin
</pre>
    </blockquote>
    <br>
  </body>
</html>

--------------080300030508050503090808--