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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](https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html) with optional
[feature modifiers](https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html#aarch64-feature-modifiers)
with the `--cflags` option as well, like:
```console
$ ./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.
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