2 title: "VPP Startup Settings"
8 CSIT code manipulates a number of VPP settings in startup.conf for
9 optimized performance. List of common settings applied to all tests and
10 test dependent settings follows.
14 List of VPP startup.conf settings applied to all tests:
16 1. heap-size <value> - set separately for ip4, ip6, stats, main
17 depending on scale tested.
18 2. no-tx-checksum-offload - disables UDP / TCP TX checksum offload in
19 DPDK. Typically needed for use faster vector PMDs (together with
21 3. buffers-per-numa <value> - sets a number of memory buffers allocated
22 to VPP per CPU socket. VPP default is 16384. Needs to be increased for
23 scenarios with large number of interfaces and worker threads. To
24 accommodate for scale tests, CSIT is setting it to the maximum possible
25 value corresponding to the limit of DPDK memory mappings (currently
26 256). For Xeon Skylake platforms configured with 2MB hugepages and VPP
27 data-size and buffer-size defaults (2048B and 2496B respectively), this
28 results in value of 215040 (256 * 840 = 215040, 840 * 2496B buffers fit
33 List of vpp startup.conf settings applied dynamically per test:
35 1. corelist-workers <list_of_cores> - list of logical cores to run VPP
36 worker data plane threads. Depends on HyperThreading and core per
38 2. num-rx-queues <value> - depends on a number of VPP threads and NIC
40 3. no-multi-seg - disables multi-segment buffers in DPDK, improves
41 packet throughput, but disables Jumbo MTU support. Disabled for all
42 tests apart from the ones that require Jumbo 9000B frame support.
43 4. UIO driver - depends on topology file definition.
44 5. QAT VFs - depends on NRThreads, each thread = 1QAT VFs.