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VPP Startup Settings
--------------------
CSIT code manipulates a number of VPP settings in startup.conf for optimized
performance. List of common settings applied to all tests and test
dependent settings follows.
See `VPP startup.conf`_
for a complete set and description of listed settings.
Common Settings
~~~~~~~~~~~~~~~
List of vpp startup.conf settings applied to all tests:
#. heap-size <value> - set separately for ip4, ip6, stats, main
depending on scale tested.
#. no-tx-checksum-offload - disables UDP / TCP TX checksum offload in DPDK.
Typically needed for use faster vector PMDs (together with
no-multi-seg).
#. socket-mem <value>,<value> - memory per numa. (Not required anymore
due to VPP code changes, will be removed in CSIT-19.04.)
Per Test Settings
~~~~~~~~~~~~~~~~~
List of vpp startup.conf settings applied dynamically per test:
#. corelist-workers <list_of_cores> - list of logical cores to run VPP
worker data plane threads. Depends on HyperThreading and core per
test configuration.
#. num-rx-queues <value> - depends on a number of VPP threads and NIC
interfaces.
#. num-rx-desc/num-tx-desc - number of rx/tx descriptors for specific
NICs, incl. xl710, x710, xxv710.
#. num-mbufs <value> - increases number of buffers allocated, needed
only in scenarios with large number of interfaces and worker threads.
Value is per CPU socket. Default is 16384.
#. no-multi-seg - disables multi-segment buffers in DPDK, improves
packet throughput, but disables Jumbo MTU support. Disabled for all
tests apart from the ones that require Jumbo 9000B frame support.
#. UIO driver - depends on topology file definition.
#. QAT VFs - depends on NRThreads, each thread = 1QAT VFs.
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