DPDK 18.11

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https://doc.dpdk.org/guides-18.11/rel_notes/release_18_11.html

New Features

Updated the C11 memory model version of the ring library.

Added changes to decrease latency for architectures using the C11 memory model version of the ring library.

On Cavium ThunderX2 platform, the changes decreased latency by 27-29% and 3-15% for MPMC and SPSC cases respectively (with 2 lcores). The real improvements may vary with the number of contending lcores and the size of the ring.

Added support for device multi-process hotplug.

Added support for hotplug and hot-unplug in a multiprocessing scenario. Any ethdev devices created in the primary process will be regarded as shared and will be available for all DPDK processes. Synchronization between processes will be done using DPDK IPC.

Added Event Ethernet Tx Adapter.

Added event ethernet Tx adapter library that provides configuration and data path APIs for the ethernet transmit stage of an event driven packet processing application. These APIs abstract the implementation of the transmit stage and allow the application to use eventdev PMD support or a common implementation. Added Distributed Software Eventdev PMD.

Added Distributed Software Eventdev PMD.

Added the new Distributed Software Event Device (DSW), which is a pure-software eventdev driver distributing the work of scheduling among all eventdev ports and the lcores using them. DSW, compared to the SW eventdev PMD, sacrifices load balancing performance to gain better event scheduling throughput and scalability.

Added Telemetry API.

Added a new telemetry API which allows applications to transparently expose their telemetry in JSON via a UNIX socket. The JSON can be consumed by any Service Assurance agent, such as CollectD.

Refer to https://doc.dpdk.org/guides-18.11/howto/telemetry.html

Known Issues

AVX-512 support has been disabled for GCC builds [1] because of a crash [2]. This can affect native machine type build targets on the platforms that support AVX512F like Intel Skylake processors, and can cause a possible performance drop. The immediate workaround is to use clang compiler on these platforms. The issue has been identified as a GCC defect and reported to the GCC community [3]. Further actions will be taken based on the GCC defect result. [1]: Commit 8d07c82b239f (“mk: disable gcc AVX512F support”) [2]: https://bugs.dpdk.org/show_bug.cgi?id=97 [3]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096