<?xml version="1.0"?>
<allocations>
  <queue name="default">
    <weight>1.0</weight>
    <schedulingPolicy>fair</schedulingPolicy>
    <fairSharePreemptionTimeout>150</fairSharePreemptionTimeout>
  </queue>

  <queuePlacementPolicy>
    <rule name="specified" />
    <rule name="secondaryGroupExistingQueue" create="false" />
    <rule name="default" />
  </queuePlacementPolicy>
</allocations>

<?xml version="1.0"?>
<allocations>
  <queue name="default">
    <weight>1.0</weight>
    <schedulingPolicy>fair</schedulingPolicy>
    <fairSharePreemptionTimeout>150</fairSharePreemptionTimeout>
    <minResources>128 mb,1vcores</minResources>
  </queue>

  <queuePlacementPolicy>
    <rule name="specified" />
    <rule name="secondaryGroupExistingQueue" create="false" />
    <rule name="default" />
  </queuePlacementPolicy>
</allocations>

Set a minimum share by default to actaully trigger pre-emption (set to a trivial quantity of RAM and one core)
Set a minimum share by default to actaully trigger pre-emption (set to a trivial quantity of RAM and one core)
