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[#876] avalanche description tweaks

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Tomek Mrugalski 2019-12-13 16:29:11 +01:00
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doc/sphinx/man/perfdhcp.8.rst
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@ -26,17 +26,25 @@ from simulated multiple clients. It is able to test both IPv4 and IPv6
servers, and provides statistics concerning response times and the
number of requests that are dropped.
The tool supports scenarios, which offer certain behaviours.
By default (basic scenario) tests are run using the full four-packet exchange sequence
(DORA for DHCPv4, SARR for DHCPv6). An option is provided to run tests
using the initial two-packet exchange (DO and SA) instead. It is also
possible to configure ``perfdhcp`` to send DHCPv6 RENEW and RELEASE messages
at a specified rate in parallel with the DHCPv6 four-way exchanges.
at a specified rate in parallel with the DHCPv6 four-way exchanges. By
default, if there is no response received with 1 second, a response is
considered lost and perfdhcp continues with other transactions.
Second scenario is called avalanche, which is selected by ``--scenario avalanche``.
It first sends as many Discovery or Solicit messages as request in -R option then
back off mechanism is used for each simulated client until all requests are
a retransmission (with exponential back off mechanism) is used for each simulated client until all requests are
answered. It will generate report when all clients get their addresses or when
it will be manually stopped. Option ``-p`` is ignored in avalanche scenario.
it will be manually stopped. This scenario attempts to replicate a
case where the server is not able to handle the traffic swiftly
enough. Real clients will assume the packet or the response was lost
and will retransmit, further increasing DHCP traffic. This is
sometimes called avalanche effect, thus the scenario name.
Option ``-p`` is ignored in avalanche scenario.
When running a performance test, ``perfdhcp`` will exchange packets with
the server under test as fast as possible unless the ``-r`` parameter is used to