+++ /dev/null
----
-title: "VPP Startup Settings"
-weight: 17
----
-
-# 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.
-
-## Common Settings
-
-List of VPP startup.conf settings applied to all tests:
-
-1. heap-size <value> - set separately for ip4, ip6, stats, main
- depending on scale tested.
-2. no-tx-checksum-offload - disables UDP / TCP TX checksum offload in
- DPDK. Typically needed for use faster vector PMDs (together with
- no-multi-seg).
-3. buffers-per-numa <value> - sets a number of memory buffers allocated
- to VPP per CPU socket. VPP default is 16384. Needs to be increased for
- scenarios with large number of interfaces and worker threads. To
- accommodate for scale tests, CSIT is setting it to the maximum possible
- value corresponding to the limit of DPDK memory mappings (currently
- 256). For Xeon Skylake platforms configured with 2MB hugepages and VPP
- data-size and buffer-size defaults (2048B and 2496B respectively), this
- results in value of 215040 (256 * 840 = 215040, 840 * 2496B buffers fit
- in 2MB hugepage).
-
-## Per Test Settings
-
-List of vpp startup.conf settings applied dynamically per test:
-
-1. corelist-workers <list_of_cores> - list of logical cores to run VPP
- worker data plane threads. Depends on HyperThreading and core per
- test configuration.
-2. num-rx-queues <value> - depends on a number of VPP threads and NIC
- interfaces.
-3. 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.
-4. UIO driver - depends on topology file definition.
-5. QAT VFs - depends on NRThreads, each thread = 1QAT VFs.
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