Release Notes

Changes in CSIT-2001


    • Intel Xeon 2n-skx, 3n-skx testbeds: VPP performance test data is not included in this report version. This is due to the lower performance and behaviour inconsistency of these systems following the upgrade of processor microcode packages (skx ucode 0x2000064), done as part of updating Ubuntu 18.04 LTS kernel version. Tested VPP and DPDK applications (L3fwd) are affected. Skx test data will be added in subsequent maintenance report version(s) once the issue is resolved. See Known Issues.

    • Intel Xeon 2n-clx testbeds: VPP performance test data is now included in this report, after resolving the issue of lower performance and behaviour inconsistency of these systems due to the Linux kernel driven upgrade of processor microcode packages to 0x500002c. The resolution is to use latest SuperMicro BIOS 3.2 (for X11DPG-QT motherboards used) that upgrades processor microcode to 0x500002c, AND NOT kernel provided ucode package as it does put system into sub-optimal state. Subset of 2n-clx VPP tests are failing due to clx system behaviour change: i) all ip4 tests with xxv710 and avf driver and ii) some cx556a rdma tests. See Known Issues.

    • Service density 2n-skx tests: Added new NF density tests with IPsec encryption between DUTs.

    • AVF tests: Full test coveraged based on code changes in CSIT core layer (driver/interface awareness) and generated by suite generator (Intel Fortville NICs only).

    • Hoststack tests: Major refactor of VPP Hoststack TCP/IP performance tests using WRK generator talking to the VPP HTTP static server plugin measuring connections per second and requests per second. Added new iperf3 with LDPreload tests, iperf3/LDPreload tests with packet loss induced via the VPP NSIM (Network Simulator) plugin, and QUIC/UDP/IP transport tests. All of the new tests measure goodput through the VPP Hoststack from client to server.

    • Latency HDRHistogram: Added High Dynamic Range Histogram latency measurements based on the new capability in TRex traffic generator. HDRH latency data presented in latency packet percentile graphs and in detailed results tables.

    • Mellanox CX556A-EDAT tests: Added tests with Mellanox ConnectX5-2p100GE NICs in 2n-clx testbeds using VPP native rdma driver.

    • IPsec reconfiguration tests: Added tests measuring the impact of IPsec tunnels creations and removals.

    • Load Balancer tests: Added VPP performance tests for Maglev, L3DSR (Direct Server Return), Layer 4 Load Balancing NAT Mode.


    • CSIT Python3 support: Full migration of CSIT from Python2.7 to Python3.6. This change includes library migration, PIP dependency upgrade, CSIT container images, infrastructure packages ugrade/installation.

    • CSIT PAPI support: Finished conversion of CSIT VAT L1 keywords to PAPI L1 KWs in CSIT using VPP Python bindings (VPP PAPI). Redesign of key components of PAPI Socket Executor and PAPI history. Due to issues with PAPI performance, VAT is still used in CSIT for all VPP scale tests. See known issues below.

    • Test Suite Generator: Added capability to generate suites for different drivers per NIC model including DPDK, AVF, RDMA. Extended coverage for all tests.

    • General Code Housekeeping: Ongoing RF keywords optimizations, removal of redundant RF keywords and aligning of suite/test setup/teardowns.


    • TRex Fortville NIC Performance: Received FVL fix from Intel resolving TRex low throughput issue. TRex per FVL NIC throughput increased from ~27 Mpps to the nominal ~37 Mpps. For detail see CSIT-1503 and TRex-519].

    • New Intel Xeon Cascadelake Testbeds: Added performance tests for 2-Node-Cascadelake (2n-clx) testbeds with x710, xxv710 and cx556a-edat NIC cards.


    • Graphs layout improvements: Improved performance graphs layout for better readibility and maintenance: test grouping, axis labels, descriptions, other informative decoration.

    • Latency graphs: Min/Avg/Max group bar latency graphs are replaced with packet latency percentile distributon at different background packet loads based on TRex latency hdrhistogram measurements.

Known Issues

List of known issues in CSIT-2001 for VPP performance tests:



Issue Description



Sporadic (1 in 200) NDR discovery test failures on x520. DPDK reporting rx-errors, indicating L1 issue. Suspected issue with HW combination of X710-X520 in LF testbeds. Not observed outside of LF testbeds.



9000B packets not supported by NICs VIC1227 and VIC1387.



Memif tests are sporadically failing on initialization of memif connection.



9000B ip4 nat44: VPP crash + coredump. VPP crashes very often in case that NAT44 is configured and it has to process IP4 jumbo frames (9000B).



All CSIT scale tests can not use PAPI due to much slower performance compared to VAT/CLI (it takes much longer to program VPP). This needs to be addressed on the PAPI side.




IPv4 IPSEC 9000B packet tests are failing as no packet is forwarded. Reason: chained buffers are not supported.



IPv4 AVF 9000B packet tests are failing on 3n-skx while passing on 2n-skx.



Intel Xeon 2n-skx, 3n-skx and 2n-clx testbeds behaviour and performance became inconsistent following the upgrade to the latest Ubuntu 18.04 LTS kernel version (4.15.0-72-generic) and associated microcode packages (skx ucode 0x2000064, clx ucode 0x500002c). VPP as well as DPDK L3fwd tests are affected.



All 2n-clx VPP ip4 tests with xxv710 and avf driver are failing.



Some 2n-clx cx556a rdma tests are failing.