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authorMark D. Gray <mark.d.gray@intel.com>2016-05-26 14:47:27 +0100
committerMark D. Gray <mark.d.gray@intel.com>2016-06-07 09:40:56 +0100
commitf5fd9fa807f85a09466b740a475007b13654dce2 (patch)
tree3f61343b78ff41761177642b254fea2097889fdb /specs
parent7f666d1ac67abdafd91ae1b3dc31010f6c28c62f (diff)
specs: Enable gerrit build of specs documentation
This patch allows gerrit to parse the spec documentation and publishes to artifacts on merge. Change-Id: Ib9d5b1229975d2b9819320af22973008885c4f58 Signed-off-by: Mark D. Gray <mark.d.gray@intel.com>
Diffstat (limited to 'specs')
-rw-r--r--specs/High-Priority-Traffic-Path.rst260
-rw-r--r--specs/template.rst272
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diff --git a/specs/High-Priority-Traffic-Path.rst b/specs/High-Priority-Traffic-Path.rst
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--- a/specs/High-Priority-Traffic-Path.rst
+++ /dev/null
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-..
- This work is licensed under a Creative Commons Attribution 3.0 Unported
- License.
-
- http://creativecommons.org/licenses/by/3.0/legalcode
-
-==========================================
-High Priority Traffic Path
-==========================================
-
-https://wiki.opnfv.org/display/ovsnfv/OVSFV+Requirement+-+High+Priority+Traffic+Path
-
-Problem description
-===================
-
-A network design may need to adequately accommodate multiple classes of traffic, each
-class requiring different levels of service in critical network elements.
-
-As a concrete example, a network element managed by a service provider may be
-handling voice and elastic data traffic. Voice traffic requires that the end-to-end
-latency and jitter is bounded to some numerical limit (in msec) accuracy in order to ensure
-sufficient quality-of-service (QoS) for the participants in the voice call.
-Elastic data traffic does not impose the same demanding requirements on the network
-(there will be essentially no requirement on jitter. For example, when downloading a
-large file across the Internet, although the bandwidth requirements may be high there
-is usually no requirement that the file arrives within a bounded time interval.
-
-Depending on the scheduling algorithms running on the network element,
-frames belonging to the data traffic may get transmitted before frames
-belonging to the voice traffic introducing unwanted latency or jitter.
-Therefore, in order to ensure deterministic latency and jitter characteristics
-end-to-end, each network element through which the voice traffic traverses
-must ensure that voice traffic is handled deterministically.
-
-Hardware switches have typically been designed to ensure certain classes
-of traffic can be scheduled ahead of other classes and are also
-over-provisioned which further ensures deterministic behavior when
-handling high priority traffic. However, software switches (which includes
-virtual switches such as Open vSwitch) may require modification in order
-to achieve this deterministic behavior.
-
-Use Cases
----------
-
-1. Program classes of service
-
-The End User specifies a number of classes of service. Each class of service
-will be represented by the value of a particular field in a frame. The class
-of service determines the priority treatment which flows in the class will
-receive, while maintaining a relative level of priority for other classes and
-a default level of treatment for the lowest priority class of service. As
-such, each class of service will be associated with a priority. The End User
-will associate classes of service and priorities to ingress ports with the
-expectation that frames that arrive on these ingress ports will get
-scheduled following the specified priorities.
-
-Note: Priority treatment of the classes of service cannot cause any one of
-the classes (even the default class) from being transferred at all. In other
-words, a strict priority treatment would likely not be successful for serving
-all classes eventually, and this is a key consideration.
-
-2. Forward high priority network traffic
-
-A remote network element sends traffic to Open vSwitch. The remote network
-element, indicates the class of service to which this flow of traffic belongs
-to by modifying a pre-determined but arbitrary field in the frame as specified
-in Use Case 1. Some examples include the Differentiated Services Code Point
-(DSCP) in an IP packet or the Priority Code Point (PCP) in an Ethernet frame.
-The relative priority treatment that frames get processed by Open vSwitch can be guaranteed by the
-values populated in these fields when the fields are different. If the fields
-are the same, ordering is not deterministic.
-
-For example: Packet A is sent with a DSCP value of 0 and packet B is sent
-with a value of 46; 0 has a lower priority than 46. Packet A arrives
-before packet B. If Open vSwitch has been configured as such, Packet
-B will be transmitted before Packet A.
-
-Proposed change
-===============
-
-TBD
-
-Alternatives
-------------
-
-TBD
-
-OVSDB schema impact
--------------------
-
-TBD
-
-User interface impact
----------------------
-
-TBD
-
-Security impact
----------------
-
-TBD
-
-Other end user impact
----------------------
-
-TBD
-
-Performance Impact
-------------------
-
-TBD
-
-Other deployer impact
----------------------
-
-TBD
-
-Developer impact
-----------------
-
-TBD
-
-Implementation
-==============
-
-Assignee(s)
------------
-
-Who is leading the writing of the code? Or is this a blueprint where you're
-throwing it out there to see who picks it up?
-
-If more than one person is working on the implementation, please designate the
-primary author and contact.
-
-Primary assignee:
- <email address>
-
-Other contributors:
- <email address>
-
-Work Items
-----------
-
-TBD
-
-Dependencies
-============
-
-TBD
-
-Testing
-=======
-
-In order to test how effectively the virtual switch handles high priority traffic
-types, the following scheme is suggested.::
-
- +---------------------------+ Ingress Traffic Parameters
- | | +-------------------------------------------+
- | |
- | | Packet Size: The size of the Ethernet frames
- | |
- | | Tmax: RFC2544 Max. Throughput for traffic of
- | PHY0 <-------+ "Packet Size"
- | |
- | | Total Offered Rate: The offered rate of both
- | | traffic classes combined expressed as a % of
- | | Tmax
- | |
- | | Ingress Rates are expressed as a percentage
- | | of Total Offered Rate.
- | |
- | | Class A:
- | OVS | Ethernet PCP = 0 (Background)
- | (BR0) | Ingress Rate : rate_ingress_a(n) Mfps
- | |
- | | Class B:
- | | Ethernet PCP = 7 (Highest)
- | | Ingress Rate : rate_ingress_b(n) Mfps
- | |
- | | Egress Traffic Measurements
- | | +-------------------------------------------+
- | | Class A:
- | | Egress Throughput : rate_egress_a(n) Mfps
- | | Egress Latency : max_lat_egrees_a(n) ms
- | | Egress Jitter : max_jit_egress_a(n) ms
- | PHY1 +------->
- | | Class B:
- | | Egress Throughput : rate_egress_b(n) Mfps
- | | Egress Latency : max_lat_egrees_b(n) ms
- +---------------------------+ Egress Jitter : max_jit_egress_b(n) ms
-
-
-Open vSwitch is configured to forward traffic between two ports agnostic to the
-traffic type. For example, using the following command:
-
-ovs-ofctl add-flow br0 in_port=0,actions=output:1
-
-The test will be carried out with the functionality to enable high-priority
-traffic enabled and disabled in order to guage the change in performance for
-both cases.
-
-Two classes of traffic will be generated by a traffic generator. In the example
-above, the classes are differentiated using the Ethernet PCP field. However,
-another means for differentiating traffic could be used, depending the
-prioritization scheme that is developed.
-
-Tests should be performed for each combination of:
-
-* Packet Sizes in (64, 512)
-* Total Offered Rate in (80, 120, 150)
-* rate_ingress_b(n) / rate_ingress_a(n) in (0.1, 0.2, 0.5)
-
-For each set, the following metrics should be collected for each traffic
-class over a specified time period:
-
-Egress Throughput (Mfps)
-Maximum Egress Latency (ms)
-Maximum Egress Jitter (ms)
-
-Documentation Impact
-====================
-
-TBD
-
-References
-==========
-
-Please add any useful references here. You are not required to have any
-reference. Moreover, this specification should still make sense when your
-references are unavailable. Examples of what you could include are:
-
-* Links to mailing list or IRC discussions
-
-- http://lists.opnfv.org/pipermail/opnfv-tech-discuss/2015-December/007193.html
-- http://ircbot.wl.linuxfoundation.org/meetings/opnfv-ovsnfv/2016/opnfv-ovsnfv.2016-03-07-13.01.html
-
-* Links to relevant research, if appropriate
-
-- https://wiki.opnfv.org/download/attachments/5046510/qos_mechanisms.pdf?version=1&modificationDate=1459187636000&api=v2
-
-* Related specifications as appropriate
-
-* Anything else you feel it is worthwhile to refer to
-
-
-History
-=======
-
-Optional section intended to be used each time the spec
-is updated to describe new design, API or any database schema
-updated. Useful to let reader understand what's happened along the
-time.
-
-.. list-table:: Revisions
- :header-rows: 1
-
- * - Release Name
- - Description
- * - Colorado
- - Introduced
diff --git a/specs/template.rst b/specs/template.rst
deleted file mode 100644
index cc5dfd8..0000000
--- a/specs/template.rst
+++ /dev/null
@@ -1,272 +0,0 @@
-..
- This work is licensed under a Creative Commons Attribution 3.0 Unported
- License.
-
- http://creativecommons.org/licenses/by/3.0/legalcode
-
-==========================================
-Example Spec - The title of your blueprint
-==========================================
-
-Include the URL of OPNFV wiki page description:
-
-https://wiki.opnfv.org/display/ovsnfv/OVSFV+Requirement+-+Example
-
-Introduction paragraph -- why are we doing anything? A single paragraph of
-prose that operators can understand. The title and this first paragraph
-should be used as the subject line and body of the commit message
-respectively.
-
-Some notes about the process:
-
-* The aim of this document is first to define the problem we need to solve,
- and second agree the overall approach to solve that problem.
-
-* This is not intended to be extensive documentation for a new feature.
-
-* You should aim to get your spec approved before writing your code.
- While you are free to write prototypes and code before getting your spec
- approved, its possible that the outcome of the spec review process leads
- you towards a fundamentally different solution than you first envisaged.
-
-* But, API changes are held to a much higher level of scrutiny.
- As soon as an API change merges, we must assume it could be in production
- somewhere, and as such, we then need to support that API change forever.
- To avoid getting that wrong, we do want lots of details about API changes
- upfront.
-
-Some notes about using this template:
-
-* Your spec should be in ReSTructured text, like this template.
-
-* Please wrap text at 79 columns.
-
-* Please do not delete any of the sections in this template. If you have
- nothing to say for a whole section, just write: None
-
-* For help with syntax, see http://sphinx-doc.org/rest.html
-
-* To test out your formatting, build the docs using sphinx
-
-* If you would like to provide a diagram with your spec, ascii diagrams are
- required. http://asciiflow.com/ is a very nice tool to assist with making
- ascii diagrams. The reason for this is that the tool used to review specs is
- based purely on plain text. Plain text will allow review to proceed without
- having to look at additional files which can not be viewed in gerrit. It
- will also allow inline feedback on the diagram itself.
-
-Problem description
-===================
-
-A detailed description of the problem. What problem is this blueprint
-addressing?
-
-Use Cases
----------
-
-What use cases does this address? What impact on actors does this change have?
-Ensure you are clear about the actors in each use case: Developer, End User,
-Deployer etc.
-
-Proposed change
-===============
-
-Here is where you cover the change you propose to make in detail. How do you
-propose to solve this problem?
-
-If this is one part of a larger effort make it clear where this piece ends. In
-other words, what's the scope of this effort?
-
-At this point, if you would like to just get feedback on the problem and
-proposed change, you can stop here and post this for review to get
-preliminary feedback. If so please say:
-Posting to get preliminary feedback on the scope of this spec.
-
-Alternatives
-------------
-
-What other ways could we do this thing? Why aren't we using those? This doesn't
-have to be a full literature review, but it should demonstrate that thought has
-been put into why the proposed solution is an appropriate one.
-
-OVSDB schema impact
--------------------
-
-Changes which require modifications to the data model often have a wider impact
-on the system. The community often has strong opinions on how the data model
-should be evolved, from both a functional and performance perspective. It is
-therefore important to capture and gain agreement as early as possible on any
-proposed changes to the data model.
-
-Questions which need to be addressed by this section include:
-
-* What new data objects and/or database schema changes is this going to
- require?
-
-User interface impact
----------------------
-
-Each user interface that is either added, changed or removed should have the
-following:
-
-* Specification for the user interface
-
-* Example use case including typical examples for both data supplied
- by the caller and the response
-
-Security impact
----------------
-
-Describe any potential security impact on the system. Some of the items to
-consider include:
-
-* Does this change touch sensitive data such as tokens, keys, or user data?
-
-* Does this change alter the interface in a way that may impact security, such as
- a new way to access sensitive information?
-
-* Does this change involve cryptography or hashing?
-
-* Does this change require the use of sudo or any elevated privileges?
-
-* Does this change involve using or parsing user-provided data? This could
- be directly at the API level or indirectly such as changes to a cache layer.
-
-* Can this change enable a resource exhaustion attack, such as allowing a
- single interaction to consume significant server resources?
-
-Other end user impact
----------------------
-
-Aside from the user interfaces, are there other ways a user will interact with this
-feature?
-
-Performance Impact
-------------------
-
-Describe any potential performance impact on the system, for example
-how often will new code be called, and is there a major change to the calling
-pattern of existing code.
-
-Examples of things to consider here include:
-
-* Will the change include any locking, and if so what considerations are there
- on holding the lock?
-
-Other deployer impact
----------------------
-
-Discuss things that will affect how you deploy and configure Open vSwitch
-that have not already been mentioned, such as:
-
-* What config options are being added? Should they be more generic than
- proposed? Are the default values ones which will work well in
- real deployments?
-
-* Is this a change that takes immediate effect after its merged, or is it
- something that has to be explicitly enabled?
-
-* If this change is a new binary, how would it be deployed?
-
-* Please state anything that those doing continuous deployment, or those
- upgrading from the previous release, need to be aware of. Also describe
- any plans to deprecate configuration values or features.
-
-Developer impact
-----------------
-
-Discuss things that will affect other developers working on Open vSwitch,
-such as:
-
-Implementation
-==============
-
-Assignee(s)
------------
-
-Who is leading the writing of the code? Or is this a blueprint where you're
-throwing it out there to see who picks it up?
-
-If more than one person is working on the implementation, please designate the
-primary author and contact.
-
-Primary assignee:
- <email address>
-
-Other contributors:
- <email address>
-
-Work Items
-----------
-
-Work items or tasks -- break the feature up into the things that need to be
-done to implement it. Those parts might end up being done by different people,
-but we're mostly trying to understand the timeline for implementation.
-
-
-Dependencies
-============
-
-* If this requires functionality of another project that is not currently used
- document that fact.
-
-* Does this feature require any new library dependencies or code otherwise not
- included in Open vSwitch? Or does it depend on a specific version of library?
-
-
-Testing
-=======
-
-Please discuss the important scenarios needed to test here, as well as
-specific edge cases we should be ensuring work correctly. For each
-scenario please specify if this requires specialized hardware.
-
-Please discuss how the change will be tested: Open vSwitch unit tests, VSPERF
-performance tests, Yardstick tests, etc.
-
-Is this untestable in gate given current limitations (specific hardware /
-software configurations available)? If so, are there mitigation plans (3rd
-party testing, gate enhancements, etc).
-
-
-Documentation Impact
-====================
-
-Which audiences are affected most by this change, and which documentation
-should be updated because of this change? Don't
-repeat details discussed above, but reference them here in the context of
-documentation for multiple audiences. If a config option
-changes or is deprecated, note here that the documentation needs to be updated
-to reflect this specification's change.
-
-References
-==========
-
-Please add any useful references here. You are not required to have any
-reference. Moreover, this specification should still make sense when your
-references are unavailable. Examples of what you could include are:
-
-* Links to mailing list or IRC discussions
-
-* Links to relevant research, if appropriate
-
-* Related specifications as appropriate
-
-* Anything else you feel it is worthwhile to refer to
-
-
-History
-=======
-
-Optional section intended to be used each time the spec
-is updated to describe new design, API or any database schema
-updated. Useful to let reader understand what's happened along the
-time.
-
-.. list-table:: Revisions
- :header-rows: 1
-
- * - Release Name
- - Description
- * - 2.x
- - Introduced