Network traffic shaping.

[Mike Kolesnik]

----- Original Message -----
> ----- Original Message -----
> | From: "Moti Asayag" <masayag at redhat.com>
> | To: "Giuseppe Vallarelli" <gvallare at redhat.com>
> | Cc: arch at ovirt.org
> | Sent: Wednesday, July 10, 2013 11:57:56 AM
> | Subject: Re: Network traffic shaping.
> | 
> | Hi Giuseppe,
> | 
> | I'm in favour of reusing the entities which represent the network QoS for a
> | network
> | interface. However I'd store the vnic network QoS and host network QoS
> | entries in
> | different tables, else we miss the distinguish between network QoS designed
> | for VMs
> | to these used for hosts.
> 
> I would rather not duplicate or having two different tables which in practice
> are almost the same. I would add a new attribute like qos_type with 2
> possible
> values for now: vnic and network to distinguish between the 2. What do you
> think?
> 
> | Which leads to the next issue: The network traffic shaping will follow the
> | Vnic Network QoS [1],
> | therefore the Vnic network QoS should be have an upper limit set by the
> | host's VM network QoS for
> | the same VM network. What would be the behaviour in case the total average
> | bit-rate of the VMs
> | exceeds the host network bit-rate ?
> 
> The underlying implementation of libvirt works in this way:
> if you shape the network bandwidth and it's tighter than the vnic
> shaped bandwidth than you will not have a bandwidth throughput of vnic
> higher than the one defined by the shaped network. The network
> bandwidth act as a constraint here. If the user gets the bandwidth
> values wrong the traffic can't go faster of what the underlying
> technology provides.
> 
> Now given this premise we can have 2 different scenarios:
> 
> Scenario 1:
> 
> User defines network QoS and vnics QoS whose values (vnic)
> for average, burst and peak should be lesser or equal
> to the ones defined in the network.
> 
> Scenario 2:
> 
> User only defines vnics QoS which is in practice still constrained by
> the underlying nic's capacity, no matter of user's wishes.
> 
> | Is there any limit for the peak or burst ? and if there is, are they differ
> | between the host network
> | QoS to the vnic QoS?
> 
> There is no limit for peak and burst or default value that libvirt provides.
> I need to add that the only compulsory attribute for bandwidth definition is
> only average, burst and peak are optional values as well as incoming and
> outgoing traffic can be shaped independently (I would use incoming and
> outgoing
> respectively for inbound and outbound, I think they're better terms for
> labels
> in the mockups)
> 
> | Regarding the 'New Logical Network' dialog, I'd suggest to add the Network
> | QoS as a left tab, rather
> | than having it on the main dialog. See [2] a mock-up of the new dialog
> | shortly which includes the
> | vnic profile left-tab, and also the QoS left-tab.
> 
> I agree on having a unified UI. Not much with the multiple tabs.
> I consider the multiple tabs approach valid when they're related
> to different concepts, where each concept is independent.
> Which is not valid in this case. I would expect to have a single
> unified tab for QoS which includes both network and vnics.

In your case the QoS is not really tied to the network parameters - is it VM, is it VLAN, etc..
Hence, by your logic, this should be on a separate left tab (there is an upcoming change to introduce these into the new/edit network dialogs).

> 
> | 
> | In addition, should there be a new 'QoS' sub-tab for the networks tab ?
> 
> See previous answer. Perhaps it might have more sense to have a vnic profiles
> as a sub-tab due to the previous considerations.

I think what Moti meant is when in the view you're viewing a network in the "networks" main tab, how would you see it's QoS.

> 
> Cheers, Giuseppe
> 
> | 
> | 
> | [1] http://www.ovirt.org/Features/Network_QoS
> | [2] http://www.ovirt.org/File:New_netwrok_profiles.png
> | 
> | Moti
> | 
> | ----- Original Message -----
> | > From: "Giuseppe Vallarelli" <gvallare at redhat.com>
> | > To: arch at ovirt.org
> | > Sent: Monday, July 8, 2013 1:45:41 PM
> | > Subject: Network traffic shaping.
> | > 
> | > Hi everybody, I'm working to implement traffic shaping at the network
> | > level
> | > [1].
> | > This feature is composed by two distinct parts: definition of traffic
> | > shaping
> | > for a logical network entity and optional redefinition of traffic shaping
> | > when
> | > the user is doing a Setup Host Networks task. Initial focus will be on
> | > first
> | > part. There are some points of contact with Network Qos [2] that's why I
> | > proposed
> | > to reuse some code backend side.
> | > 
> | > Cheers, Giuseppe
> | > 
> | > [1] http://www.ovirt.org/Features/Network_traffic_shaping
> | > [2] http://www.ovirt.org/Features/Network_QoS
> | > _______________________________________________
> | > Arch mailing list
> | > Arch at ovirt.org
> | > http://lists.ovirt.org/mailman/listinfo/arch
> | > 
> | 
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