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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Mathieu Rohon wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D">></span>I'm also very interested in scheduling VMs with Network requirement. This seems to be in the scope of NFV workgroup
<span style="color:#1F497D">></span>[1].<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#1F497D">></span>For instance, I think that scheduling should take into account bandwith/QoS requirement for a VM, or specific Nic
<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This falls in my area of interest as well. We’re working on making network quality of service guarantees by means of a combination
of DSCP marking with a reservation database and separate hardware queues in physical network switches in order to ensure that the reservations granted don’t exceed the wire speed of the switches. Right now the only option if the total of requested reservations
would exceed the wire speed of the switches is to deny reservations on the basis of “first come, first served” and “last come, doesn’t get served”, in other words simply issuing a failure response at reservation time to any tenants who attempt to make reservations
after a particular switch port is maxed out (from a reservation perspective, not necessarily maxed out from an actual utilization perspective at any given moment.)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">However, with the element of chance in VM scheduling to compute node, it’s possible that a tenant could get a deny response from
the reservation server because their VM landed on a particularly reservation heavy rack. If their VM happened to land on a compute node in a different rack then there might well be plenty of excess bandwidth on that rack’s uplink. But our current implementation
has no way to tell Nova or the tenant that a reservation that was denied could have been granted if the VM were relocated to a less network overloaded rack.<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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