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[Armando Migliaccio <1560963@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1560963

Title:
  [RFE] Minimum bandwidth support (egress)

Status in neutron:
  Fix Released

Bug description:
  Minimum bandwidth support (opposed to bandwidth limiting), guarantees
  a port minimum bandwidth when it's neighbours are consuming egress
  traffic and can be throttled in favor of the guaranteed port.

  Strict minimum bandwidth support requires scheduling cooperation, to
  avoid physical interfaces overcommit. This RFE addresses only the
  hypervisor side of it. Scheduling cooperation will be addressed in a
  separate RFE [2] , this work is a pre-requisite for the 2nd step.

  Use cases
  =========

  NFV/telcos are interested in this type of rules to make sure functions
  don't overcommit computes, and that any spawn of the same architecture
  will perform exactly as expected. This RFE is a prerequisite for [1].

  Which in the mean time will provide a best effort guarantee on minimum
  bandwidth.

  CSP could make use of it to provide guaranteed bandwidth for
  streaming, etc...

  Notes
  =====

  Technologies like SR-IOV support that, and OVS & Linux bridge can be
  configured to support this type of service. Where in OvS it requires
  to use veth ports between bridges instead of patch ports, it
  introduces a performance overhead of a ~20%. Supporting this kind of
  rule for OvS agents must be made optional, so the administrators can
  choose it only when they really need it.

  SR-IOV seems not to incur in any performance penalty.

  This RFE title has been corrected to tackle only with instance-egress
  traffic, as per comments #1 and #2 of this rfe/bug, ingress is
  problematic, and even if it can be tackled, it's a much more complex
  beast, @armax knows about it [1]

  [1] https://www.openstack.org/summit/vancouver-2015/summit-
  videos/presentation/supporting-network-bandwidth-guarantees-with-
  openstack-an-implementation-perspective

  [2] https://bugs.launchpad.net/neutron/+bug/1578989

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