diff --git a/docs/Measuring-E2E-MS-Performance.md b/docs/Measuring-E2E-MS-Performance.md
index 4960ddea7637cd8f638b49e0c9b611af73e56b63..401308a26f93ebbaf9baed33ac8872dbab9f968b 100644
--- a/docs/Measuring-E2E-MS-Performance.md
+++ b/docs/Measuring-E2E-MS-Performance.md
@@ -30,6 +30,19 @@
|[Simon Crowle](mailto:sgc@it-innovation.soton.ac.uk)|[University of Southampton, IT Innovation Centre](http://www.it-innovation.soton.ac.uk)|
|[Nikolay Stanchev](mailto:ns17@it-innovation.soton.ac.uk)|[University of Southampton, IT Innovation Centre](http://www.it-innovation.soton.ac.uk)|
+### Definitions
+
+Readers of this document are assumed to have at least read the [CLMC information model](clmc-information-model.md). Here we explore the requirements which inform the definition of metrics that determine *'end-to-end'* media service performance. Before continuing, some terms are defined:
+
+| term | definition |
+| --- | --- |
+| *client* | an end-user of a FLAME media service - typically somebody accessing the service via an mobile computing device connected to an _EP router_ |
+| *endpoint* | an endpoint (EP) is a virtual machine (VM) connected to the FLAME network by a _service function router_ |
+| *service function router* | a SFR is a VM that allows EPs to communicate with one another using fully qualified domain names (FQDN), rather than IP addresses |
+| *network node* | a _service function router_ or other hardware that receives and sends network traffic along network connections attached to it |
+| *media component* | a media component (MC) is a process that in part or wholly realizes the functionality of a media service |
+| *E2E path* | the directed, acyclic traversal of FLAME network nodes, beginning with a source _EP_ and moving to a target _EP_ via network nodes in the FLAME network |
+| *round trip time* | the total time taken for a service request to i) traverse an _E2E path_, ii) be processed at the _MC_, iii) be returned as a response via an _E2E path_
### **Assumptions**
@@ -57,21 +70,8 @@ The delay field value is the network end-to-end delay in milliseconds for the pa
Here, the **FQDN**, **sf_instance** and **endpoint** tag values identify a unique response time measurement. The response time field value is the
response time (measured in seconds) for the media service only, and it does not take into account any of the network measurements.
-
## E2E Model
-Readers of this document are assumed to have at least read the [CLMC information model](clmc-information-model.md). Here we explore the requirements which inform the definition of metrics that determine *'end-to-end'* media service performance. Before continuing, some terms are defined:
-
-| term | definition |
-| --- | --- |
-| *client* | an end-user of a FLAME media service - typically somebody accessing the service via an mobile computing device connected to an _EP router_ |
-| *endpoint* | an endpoint (EP) is a virtual machine (VM) connected to the FLAME network |
-| *service router* | an EP that allows other EPs to communicate with one another using fully qualified domain names (FQDN), rather than IP addresses |
-| *network node* | an _EP_, _service router_ or other hardware that receives and sends network traffic along network connections attached to it |
-| *media component* | a media component (MC) is a process that in part or wholly realizes the functionality of a media service |
-| *E2E path* | the directed, acyclic traversal of FLAME network nodes, beginning with a source _EP_ and moving to a target _EP_ via network nodes in the FLAME network |
-| *round trip time* | the total time taken for a service request to i) traverse an _E2E path_, ii) be processed at the _MC_, iii) be returned as a response via an _E2E path_
-
In the sections that follow we set out some basic properties of a potential media service and then explore these in more detail with a concrete example. Following on from this analysis we provide a test-based approach to the specification of E2E media service performance measures.
### E2E SFC
@@ -94,15 +94,20 @@ The first example above imagines a client simply requesting some data be stored
### E2E simple chain
-Next we will define a very simple network into which we will place a data processing EP and a data storage EP - we assert the clients could connect to any of _service routers_ that link these MC together.
+Next we will define a very simple network into which we will place a data processing EP and a data storage EP - we assert the clients could connect to any of _service function routers_ that link these MC together.
+
+
-
+Our simple network consists of three _service function routers_ (SFRs) that connect clients with MC data and storage functionality; a demand from client 1 for the storage function could be routed in one network hop from router 'A' to router 'C' or in two from routers 'A' -> 'B' -> 'C'. A demand for storage function from _client 2_ would include zero network hops.
-Our simple network consists of three _service routers_ that connect clients with MC data and storage functionality; each demand from client 1 for the storage function could be routed in one network hop from router 'A' to router 'C' or in two from routers 'A' -> 'B' -> 'C'. A demand for storage function from _client 2_ would include zero network hops.
+> __Side note: FLAME network scope__
+>
+> Readers are reminded that low-level network traffic metrics gathered by the FLAME platform are restricted to observations of network performance between SFRs. The first and last steps (typically between a client and media component) are not captured at the time of writing - these links are denoted by a dotted line (`--->`) in our diagrams.
+>
### E2E simple chain metrics
-A principal metric we use to understand E2E performance is mean end-to-end _delay_: the average time taken between a request or response being transmitted and received _within the FLAME network_. Scoping the E2E delay to within the FLAME network is an important qualification since it is only within this network that all necessary measurements can reliably be taken.
+A principal metric we use to understand E2E performance is the average end-to-end _delay_: the _mean_ time taken between a request or response being transmitted and received _within the FLAME network_. Scoping the E2E delay to within the FLAME network is an important qualification since it is only within this network that all necessary measurements can reliably be taken.
An out-going simple E2E request chain looks like this:
@@ -116,12 +121,36 @@ whilst for the response E2E delay, we see this:
-Above we denote the time required for an service router to handle (or pass on) an in-coming message as _handle request_ or _handle response_. When a message is first encountered by a service router, an optimized path through the FLAME network must also be determined; this is labelled above as _route specification_. The _round trip time_ is the sum of the request, service processing and response delays.
+Above we denote the time required for an service function router to handle (or pass on) an in-coming message as _handle request_ or _handle response_. When a message is _handled_ by a service function router there are a number of processes that incur (small amounts of) delay:
+
+* _Processing delay_: error checking and an optimized route through the network for the HTTP packet must be determined
+* _Queuing delay_: the time a HTTP packet waits in a queue whilst other packets ahead of it are transmitted
+* _Transmission delay_: the time taken for the packet bits to be copied out into the transmission medium of the network
+
+The _round trip time_ is the sum of the request, service processing and response delays.
> __Side note:__
> To understand _delay_ more robustly, we may also consider the rate at which requests or responses arrive (_arrival rate_) at each node in the network since message management (queuing, for example) will have an effect at scale. Similarly, the _payload size_ of the messages being handled could also be observed since the quantity of data traversing the SFC will also impact delay in similar, large scale scenarios.
>
+### E2E extended chain
+
+Up until this point we have considered an elementary SFC in which there is only one class of media component. In a more realistic scenario, we would expect a media service function to be composed of multiple MCs that are distributed and connected to multiple nodes in the FLAME network. Below we have extended the simple chain to include a greater level of complexity with respect to service function chains, whilst holding the network topology constant (adding network SFRs simply introduces additional hops to the problem space at this stage). In addition to indicating extra clients and MCs, weights have been added to the network arcs to indicate relative network latency between SFRs.
+
+
+
+Imagine a media service that both stores and processes high volumes of complex media streams. Consider as well a distributed population of clients making demands on this service. Successfully handling high demand for this service could mean deploying several instances of its media components (storage and processing) across multiple VMs which interoperate and share the demand load. Since clients and MCs are distributed, service function requests (made by both) will likely give rise to propagating waves of activity, load (and delay) from multiple nodes across the FLAME platform. For simplicity, let us assume our multi-media component service implements a request by processing some media data from the client and then storing it (returning some result to client). Here is client 1's request as it passes through the FLAME network and its MCs:
+
+
+
+In the figure above the green arcs indicate service request travel whilst the blue denotes the response path. The shortest route directs the request to SFR 'B' and the consequent storage request travels on to SFR 'C'. __Responses return along the path used by the request__. Let's see the same request from client 2, who has just joined the network:
+
+
+
+For this client, the _locality of reference_ for processing and then storing her data is high: both of the associated MCs are located on VMs attached to the same SFR. We could expect client 2's response time to be low for this reason. _Now for the sake of example only, let us assume that the hardware running MC Processor A can only effectively handle one request at any time and that any more than this will result in a substantial degradation in processing performance_. Client 3 joins the network:
+
+__TO DO__
+
## E2E Measurement
### **Idea**
diff --git a/docs/figures/e2eFigures.graphml b/docs/figures/e2eFigures.graphml
index 7e150e6312fdfa0d3b14f03d04423e8faceb54ec..492baa997725dd38345822bbe8b48d1b03888798 100644
--- a/docs/figures/e2eFigures.graphml
+++ b/docs/figures/e2eFigures.graphml
@@ -15,25 +15,23 @@
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+ <y:SVGModel svgBoundsPolicy="0">
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+ <y:Shape type="rectangle"/>
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+ <y:Shape type="rectangle"/>
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+ </node>
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+ <y:SVGModel svgBoundsPolicy="0">
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+ <y:Shape type="rectangle"/>
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+ <node id="n23">
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+ <y:ShapeNode>
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+ <y:Shape type="rectangle"/>
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