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README-DPDK.md

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Seastar and DPDK

Seastar uses the Data Plane Development Kit to drive NIC hardware directly. This provides an enormous performance boost.

To enable DPDK, specify --enable-dpdk to ./configure.py, and --dpdk-pmd as a run-time parameter. This will use the DPDK package provided as a git submodule with the seastar sources.

Please note, if --enable-dpdk is used to build DPDK on an aarch64 machine, you need to specify target architecture with optional feature modifiers with the --cflags option as well, like:

$ ./configure.py --mode debug --enable-dpdk --cflags='-march=armv8-a+crc+crypto'

To use your own self-compiled DPDK package, follow this procedure:

  1. Setup host to compile DPDK:
    • Ubuntu sudo apt-get install -y build-essential linux-image-extra-$(uname -r)
  2. Prepare a DPDK SDK:
    • Download the latest DPDK release: wget http://dpdk.org/browse/dpdk/snapshot/dpdk-2.0.0.tar.gz
    • Untar it.
    • Edit config/common_linuxapp: set CONFIG_RTE_MBUF_REFCNT_ATOMIC and CONFIG_RTE_LIBRTE_KNI to 'n'.
    • Start the tools/setup.sh script as root.
    • Compile a linuxapp target (option 9).
    • Install IGB_UIO module (option 12).
    • Bind some physical port to IGB_UIO (option 18).
    • Configure hugepage mappings (option 15/16).
  3. Modify the CMake cache (CMakeCache.txt) to inform CMake of the location of the installed DPDK SDK.