2. ISA-L Compression Poll Mode Driver
The ISA-L PMD (librte_pmd_isal_comp) provides poll mode compression & decompression driver support for utilizing Intel ISA-L library, which implements the deflate algorithm for both compression and decompression
ISA-L PMD has support for:
Huffman code type:
Window size support:
- Chained mbufs are not supported, for future release.
- Compressdev level 0, no compression, is not supported. ISA-L level 0 used for fixed huffman codes.
- Checksums are not supported, for future release.
To build DPDK with Intel’s ISA-L library, the user is required to download the library from https://github.com/01org/isa-l.
Once downloaded, the user needs to build the library, the ISA-L autotools are usually sufficient:
make can be used to install the library on their system, before building DPDK:
make sudo make install
To build with meson, the libisal.pc file, must be copied into “pkgconfig”, e.g. /usr/lib/pkgconfig or /usr/lib64/pkgconfig depending on your system, for meson to find the ISA-L library. The libisal.pc is located in library sources:
cp isal/libisal.pc /usr/lib/pkgconfig/
In order to enable this virtual compression PMD, user must:
To use the PMD in an application, user must:
rte_vdev_init("compress_isal")within the application.
--vdev="compress_isal"in the EAL options, which will call
The following parameter (optional) can be provided in the previous two calls:
socket_id:Specify the socket where the memory for the device is going to be allocated (by default, socket_id will be the socket where the core that is creating the PMD is running on).