[ovirt-users] Bandiwdth limit on a Virtual Machine

[Fernando Frediani]

Thanks for the clarification Yaniv.
Perhaps at some point we can set this value manually to reflect in the
interface the maximum the VM can do either limited by the Host Nic or QoS.

Regards,
Fernando

2017-02-13 17:58 GMT-02:00 Yaniv Kaul <ykaul at redhat.com>:

>
>
> On Mon, Feb 13, 2017 at 8:30 PM, Fernando Frediani <
> fernando.frediani at upx.com.br> wrote:
>
>> Hello Yaniv.
>>
>> Yes that exactly the bonding hash I am using layer3+4.
>>
>> I have another server where I run simple libvirt/KVM in a similar
>> scenario e it does balance the traffic well between all physical interfaces
>> on the host as there are many individual connections to the VM.
>>
>> But my question was if there was anything that hard limit any VM traffic
>> to 1Gb unless you change and also what the speed the is shown on the
>> interface is related to ? 1Gb, 10Gb or if you can set that specifically ?
>>
>
> Nope, no limit. It's just when virtio was invented they needed to give it
> some speed (to show in Windows, ethtool, etc.) and 1Gb seemed like a good
> nice number. It's not enforced anywhere.
> Y.
>
>
>> Fernando
>>
>> On 13/02/2017 16:25, Yaniv Kaul wrote:
>>
>>
>>
>> On Mon, Feb 13, 2017 at 6:25 PM, Fernando Frediani <
>> <fernando.frediani at upx.com.br>fernando.frediani at upx.com.br> wrote:
>>
>>> Hello.
>>>
>>> Is there any limitation of bandwidth for a Virtual Machine per default ?
>>>
>>> I have a host with a bonding of 3 x 1Gb and the VM is connected to that
>>> bonding. On the Engine interface on the VM status I see "Network" and it
>>> has a percentage and a tiny graph. What that percentage is related to ? 1Gb
>>> ? 3Gb ? 10Gb ?
>>>
>>> Is there anything that has to be done in order the VM can achieve speeds
>>> over 1Gbps ?
>>>
>>
>> To the external network, you cannot easily achieve >1Gb, unless you open
>> multiple connections that will go over multiple physical NICs. It depends
>> on the bond hashing policy. layer3+4 might make it easier to achieve. This
>> is not very different than a connection from the host. (I think UDP should
>> be easier, but it's less interesting?)
>>
>> VM to VM traffic should easily overcome 1Gbps.
>> Y.
>>
>>
>>>
>>>
>>> Fernando
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>>
>>
>>
>
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