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Intel® QuickAssist Technology (QAT) QATzip Library

Table of Contents

Introduction

QATZip is a user space library which builds on top of the Intel® QuickAssist Technology user space library, to provide extended accelerated compression and decompression services by offloading the actual compression and decompression request(s) to the Intel® Chipset Series. QATZip produces data using the standard gzip* format (RFC1952) with extended headers. The data can be decompressed with a compliant gzip* implementation. QATzip is design to take full advantage of the performance provided by Intel® QuickAssist Technology.

Licensing

The Licensing of the files within this project is split as follows:

Intel® Quickassist Technology (QAT) QATzip - BSD License. Please see the LICENSE file contained in the top level folder. Further details can be found in the file headers of the relevant files.

Example Intel® Quickassist Technology Driver Configuration Files contained within the folder hierarchy config_file - Dual BSD/GPLv2 License. Please see the file headers of the configuration files, and the full GPLv2 license contained in the file LICENSE.GPL within the config_file folder.

Features

  • Acceleration of compression and decompression utilizing Intel® QuickAssist Technology, including a utility to compress and decompress files.
  • Dynamic memory allocation for zero copy, by exposing qzMalloc() and qzFree() allowing working buffers to be pinned, contiguous buffers that can be used for DMA operations to and from the hardware.
  • Instance over-subscription, allowing a number of threads in the same process to seamlessly share a smaller number of hardware instances.
  • Memory allocation backed by huge page to provide access to pinned, contiguous memory. This is useful if there is contention for traditional kernel memory.
  • Configurable accelerator device sharing among processes.
  • Optional software failover for both compression and decompression services. QATzip may switch to software if there is insufficient system resources including acceleration instances or memory. This feature allows for a common software stack between server platforms that have acceleration devices and non-accelerated platforms.

Hardware Requirements

This QATzip library supports compression and decompression offload to the following acceleration devices:

Software Requirements

This release was validated on the following:

  • QATzip has been tested with the latest Intel® QuickAssist Acceleration Driver. Please download the QAT driver from the link https://01.org/intel-quickassist-technology
  • QATzip has been tested by Intel® on CentOS 7.2.1511 with kernel 3.10.0-327.el7.x86_64
  • Zlib* library of version 1.2.7 or higher
  • Suggest GCC* of version 4.8.5 or higher

Additional Information

The compression level in QATzip could be mapped to standard zlib* as below:

  • QATzip level 1 - 4, similar to zlib* level 1 - 4.
  • QATzip level 5 - 8, we map them to QATzip level 4.
  • QATzip level 9, we will use software zlib* to compress as level 9.

Limitations

  • Currently QATzip only supports static Huffman tree encoding. Dynamic encoding is disabled.

  • The partitioned internal chunk size of 16 KB is disabled, this chunk is used for QAT hardware DMA.

  • For some certain standard zlib* software in level 9 compressed input data, QATzip decompressor might generate incorrect output length.

Installation Instructions

Build Intel® QuickAssist Technology Driver

Please follow the instructions contained in:

For Intel® C62X Series Chipset: Intel® QuickAssist Technology Software for Linux* - Getting Started Guide - HW version 1.7 (336212)

For Intel® Communications Chipset 89XX Series: Intel® Communications Chipset 89xx Series Software for Linux* - Getting Started Guide (330750)

These instructions can be found on the 01.org website in the following section:

Intel® Quickassist Technology

Install QATzip

Set below environment variable

ICP_ROOT: the root directory of your QAT driver source tree

QATZIP_ROOT: the root directory of your QATzip source tree

Enable huge page feature configure huge page

    echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
    rmmod usdm_drv
    insmod $ICP_ROOT/build/usdm_drv.ko max_huge_pages=1024 max_huge_pages_per_process=16

Compile and Install QATzip

    cd $QATZIP_ROOT
    ./configure
    make clean
    make all install

For more configure options, please run "./configure -h" for help

Update the configuration files

copy the configure file(s) from directory of $QATZIP_ROOT/config_file/$YOUR_PLATFORM/$CONFIG_TYPE/*.conf to directory of /etc

YOUR_PLATFORM: the QAT hardware platform, c6xx for Intel® C62X Series Chipset, dh895xcc for Intel® Communications Chipset 8925 to 8955 Series

CONFIG_TYPE: tuned configure file(s) for different usage, multiple_process_opt for multiple process optimization, multiple_thread_opt for multiple thread optimization

Restart the QAT driver

    service qat_service restart

With current configuration, each PCI-e device in C6XX platform could support up to at most 32 processes

Test QATzip

Run the following command to check if the QATzip is setup correctly for compressing or decompressing files:

    qzip -k $your_input_file (add -h for help)

    This compression and decompression util could support below options:
    "  -A, --algorithm   set algorithm type, currently only support deflate",
    "  -d, --decompress  decompress",
    "  -h, --help        give this help",
    "  -H, --huffmanhdr  set huffman header type",
    "  -k, --keep        keep (don't delete) input files",
    "  -V, --version     display version number",
    "  -L, --level       set compression level",
    "  -C, --chunksz     set chunk size",

QATzip API Manual

Please refer to file QATzip-man.pdf under the docs folder

Intended Audience

The target audience is software developers, test and validation engineers, system integrators, end users and consumers for QATzip integrated Intel® Quick Assist Technology

Legal

Intel® disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

This document contains information on products, services and/or processes in development. All information provided here is subject to change without notice. Contact your Intel® representative to obtain the latest forecast , schedule, specifications and roadmaps.

The products and services described may contain defects or errors known as errata which may cause deviations from published specifications. Current characterized errata are available on request.

Copies of documents which have an order number and are referenced in this document may be obtained by calling 1-800-548-4725 or by visiting www.intel.com/design/literature.htm.

Intel, the Intel logo are trademarks of Intel Corporation in the U.S. and/or other countries.

*Other names and brands may be claimed as the property of others