** 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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