X-Git-Url: https://gerrit.fd.io/r/gitweb?p=csit.git;a=blobdiff_plain;f=docs%2Freport%2Fintroduction%2Fmethodology_reconf.rst;fp=docs%2Freport%2Fintroduction%2Fmethodology_reconf.rst;h=0000000000000000000000000000000000000000;hp=976cd7a6a3ab337423bb26c1e4828430278cea9b;hb=374954b9d648f503f6783325a1266457953a998d;hpb=46eac7bb697e8261dba5b439a15f5a6125f31760

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-.. _reconf_tests:
-
-Reconfiguration Tests
-^^^^^^^^^^^^^^^^^^^^^
-
-.. important::
-
-    **DISCLAIMER**: Described reconf test methodology is experimental, and
-    subject to change following consultation within csit-dev, vpp-dev
-    and user communities. Current test results should be treated as indicative.
-
-Overview
-~~~~~~~~
-
-Reconf tests are designed to measure the impact of VPP re-configuration
-on data plane traffic.
-While VPP takes some measures against the traffic being
-entirely stopped for a prolonged time,
-the immediate forwarding rate varies during the re-configuration,
-as some configurations steps need the active dataplane worker threads
-to be stopped temporarily.
-
-As the usual methods of measuring throughput need multiple trial measurements
-with somewhat long durations, and the re-configuration process can also be long,
-finding an offered load which would result in zero loss
-during the re-configuration process would be time-consuming.
-
-Instead, reconf tests first find a througput value (lower bound for NDR)
-without re-configuration, and then maintain that ofered load
-during re-configuration. The measured loss count is then assumed to be caused
-by the re-configuration process. The result published by reconf tests
-is the effective blocked time, that is
-the loss count divided by the offered load.
-
-Current Implementation
-~~~~~~~~~~~~~~~~~~~~~~
-
-Each reconf suite is based on a similar MLRsearch performance suite.
-
-MLRsearch parameters are changed to speed up the throughput discovery.
-For example, PDR is not searched for, and the final trial duration is shorter.
-
-The MLRsearch suite has to contain a configuration parameter
-that can be scaled up, e.g. number of tunnels or number of service chains.
-Currently, only increasing the scale is supported
-as the re-configuration operation. In future, scale decrease
-or other operations can be implemented.
-
-The traffic profile is not changed, so the traffic present is processed
-only by the smaller scale configuration. The added tunnels / chains
-are not targetted by the traffic.
-
-For the re-configuration, the same Robot Framework and Python libraries
-are used, as were used in the initial configuration, with the exception
-of the final calls that do not interact with VPP (e.g. starting
-virtual machines) being skipped to reduce the test overall duration.
-
-Discussion
-~~~~~~~~~~
-
-Robot Framework introduces a certain overhead, which may affect timing
-of individual VPP API calls, which in turn may affect
-the number of packets lost.
-
-The exact calls executed may contain unnecessary info dumps, repeated commands,
-or commands which change a value that do not need to be changed (e.g. MTU).
-Thus, implementation details are affecting the results, even if their effect
-on the corresponding MLRsearch suite is negligible.
-
-The lower bound for NDR is the only value safe to be used when zero packets lost
-are expected without re-configuration. But different suites show different
-"jitter" in that value. For some suites, the lower bound is not tight,
-allowing full NIC buffers to drain quickly between worker pauses.
-For other suites, lower bound for NDR still has quite a large probability
-of non-zero packet loss even without re-configuration.