[ovirt-users] Bandiwdth limit on a Virtual Machine

[Yaniv Kaul]

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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