[libvirt-users] VM Performance using KVM Vs. VMware ESXi

[Sven Schwedas]

On 2015-04-14 14:33, Jatin Davey wrote:
> Thanks Dominique & Daniel.
> 
> Looks like i need to upgrade my VMs kernel to make it aware of virtio.

Unless their kernels are very old, you only need to rebuild your initrd
as documented in the wiki (or similarly for other distributions).

> 
> 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 at cisco.com] 
>> Verzonden: dinsdag 14 april 2015 13:39
>> Aan: Daniel P. Berrange
>> CC: Dominique Ramaekers; libvirt-users at 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
> 
> 
> 
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-- 
Mit freundlichen Grüßen, / Best Regards,
Sven Schwedas
Systemadministrator
TAO Beratungs- und Management GmbH | Lendplatz 45 | A - 8020 Graz
Mail/XMPP: sven.schwedas at tao.at | +43 (0)680 301 7167
http://software.tao.at

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