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| -rw-r--r-- | docs/report/introduction/methodology.rst | 1 | ||||
| -rw-r--r-- | docs/report/introduction/methodology_terminology.rst | 78 |
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diff --git a/docs/report/introduction/methodology.rst b/docs/report/introduction/methodology.rst index 506fa73b5b..b111fe51d3 100644 --- a/docs/report/introduction/methodology.rst +++ b/docs/report/introduction/methodology.rst @@ -6,6 +6,7 @@ Test Methodology .. toctree:: + methodology_terminology methodology_vpp_forwarding_modes methodology_tunnel_encapsulations methodology_vpp_features diff --git a/docs/report/introduction/methodology_terminology.rst b/docs/report/introduction/methodology_terminology.rst new file mode 100644 index 0000000000..db76827a5a --- /dev/null +++ b/docs/report/introduction/methodology_terminology.rst @@ -0,0 +1,78 @@ +Terminology +----------- + +- **Frame size**: size of an Ethernet Layer-2 frame on the wire, including + any VLAN tags (dot1q, dot1ad) and Ethernet FCS, but excluding Ethernet + preamble and inter-frame gap. Measured in Bytes. +- **Packet size**: same as frame size, both terms used interchangeably. +- **Inner L2 size**: for tunneled L2 frames only, size of an encapsulated + Ethernet Layer-2 frame, preceded with tunnel header, and followed by + tunnel trailer. Measured in Bytes. +- **Inner IP size**: for tunneled IP packets only, size of an encapsulated + IPv4 or IPv6 packet, preceded with tunnel header, and followed by + tunnel trailer. Measured in Bytes. +- **Device Under Test (DUT)**: In software networking, "device" denotes a + specific piece of software tasked with packet processing. Such device + is surrounded with other software components (such as operating system + kernel). It is not possible to run devices without also running the + other components, and hardware resources are shared between both. For + purposes of testing, the whole set of hardware and software components + is called "System Under Test" (SUT). As SUT is the part of the whole + test setup performance of which can be measured with :rfc:`2544`, using + SUT instead of :rfc:`2544` DUT. Device under test + (DUT) can be re-introduced when analyzing test results using whitebox + techniques, but this document sticks to blackbox testing. +- **System Under Test (SUT)**: System under test (SUT) is a part of the + whole test setup whose performance is to be benchmarked. The complete + methodology contains other parts, whose performance is either already + established, or not affecting the benchmarking result. +- **Bi-directional throughput tests**: involve packets/frames flowing in + both transmit and receive directions over every tested interface of + SUT/DUT. Packet flow metrics are measured per direction, and can be + reported as aggregate for both directions (i.e. throughput) and/or + separately for each measured direction (i.e. latency). In most cases + bi-directional tests use the same (symmetric) load in both directions. +- **Uni-directional throughput tests**: involve packets/frames flowing in + only one direction, i.e. either transmit or receive direction, over + every tested interface of SUT/DUT. Packet flow metrics are measured + and are reported for measured direction. +- **Packet Loss Ratio (PLR)**: ratio of packets received relative to packets + transmitted over the test trial duration, calculated using formula: + PLR = ( pkts_transmitted - pkts_received ) / pkts_transmitted. + For bi-directional throughput tests aggregate PLR is calculated based + on the aggregate number of packets transmitted and received. +- **Packet Throughput Rate**: maximum packet offered load DUT/SUT forwards + within the specified Packet Loss Ratio (PLR). In many cases the rate + depends on the frame size processed by DUT/SUT. Hence packet + throughput rate MUST be quoted with specific frame size as received by + DUT/SUT during the measurement. For bi-directional tests, packet + throughput rate should be reported as aggregate for both directions. + Measured in packets-per-second (pps) or frames-per-second (fps), + equivalent metrics. +- **Bandwidth Throughput Rate**: a secondary metric calculated from packet + throughput rate using formula: bw_rate = pkt_rate - (frame_size + + L1_overhead) - 8, where L1_overhead for Ethernet includes preamble (8 + Bytes) and inter-frame gap (12 Bytes). For bi-directional tests, + bandwidth throughput rate should be reported as aggregate for both + directions. Expressed in bits-per-second (bps). +- **Non Drop Rate (NDR)**: maximum packet/bandwith throughput rate sustained + by DUT/SUT at PLR equal zero (zero packet loss) specific to tested + frame size(s). MUST be quoted with specific packet size as received by + DUT/SUT during the measurement. Packet NDR measured in + packets-per-second (or fps), bandwidth NDR expressed in + bits-per-second (bps). +- **Partial Drop Rate (PDR)**: maximum packet/bandwith throughput rate + sustained by DUT/SUT at PLR greater than zero (non-zero packet loss) + specific to tested frame size(s). MUST be quoted with specific packet + size as received by DUT/SUT during the measurement. Packet PDR + measured in packets-per-second (or fps), bandwidth PDR expressed in + bits-per-second (bps). +- **Maximum Receive Rate (MRR)**: packet/bandwidth rate regardless of PLR + sustained by DUT/SUT under specified Maximum Transmit Rate (MTR) + packet load offered by traffic generator. MUST be quoted with both + specific packet size and MTR as received by DUT/SUT during the + measurement. Packet MRR measured in packets-per-second (or fps), + bandwidth MRR expressed in bits-per-second (bps). +- **Trial**: a single measurement step. +- **Trial duration**: amount of time over which packets are transmitted and + received in a single throughput measurement step. |