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Jim Harris ff7e2122c7 nvme: reduce number of mmio writes in completion path 
Instead of writing the completion doorbell once per completion,
just write it once at the end of the completion while loop.
This reduces the number of mmio writes by coalescing several
writes into one when we get multiple completions at a time.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I3cc3864dcfe43186bec51be1a732e84ef3be05ae
2016-02-08 09:52:15 -07:00
doc nvme: refactor nvme_attach() into nvme_probe() 2016-02-03 11:15:31 -07:00
examples ioat: refactor ioat_attach() API into ioat_probe() 2016-02-08 09:50:57 -07:00
include/spdk ioat: refactor ioat_attach() API into ioat_probe() 2016-02-08 09:50:57 -07:00
lib nvme: reduce number of mmio writes in completion path 2016-02-08 09:52:15 -07:00
mk SPDK: Support configuring libpciaccess library 2016-02-04 17:30:09 -07:00
scripts unbind.sh: fix ioat unbind to work with 'set -e' 2016-02-08 09:50:57 -07:00
test ioat: refactor ioat_attach() API into ioat_probe() 2016-02-08 09:50:57 -07:00
.astylerc build: check formatting with astyle 2015-09-23 09:05:51 -07:00
.gitignore build: add CONFIG_COVERAGE code coverage option 2015-11-02 14:40:49 -07:00
.travis.yml build: add Travis CI integration 2015-11-04 11:05:59 -07:00
autobuild.sh spdk: add the ioat_kperf test tool to autobuild system 2016-01-22 07:58:13 -07:00
autopackage.sh CONFIG: allow overriding options in make command 2015-10-22 12:24:57 -07:00
autotest.sh spdk: add the ioat_kperf test tool to autobuild system 2016-01-22 07:58:13 -07:00
CONFIG SPDK: Support configuring libpciaccess library 2016-02-04 17:30:09 -07:00
LICENSE Remove year from copyright headers. 2016-01-28 08:54:18 -07:00
Makefile Remove year from copyright headers. 2016-01-28 08:54:18 -07:00
PORTING.md Add porting guide. 2015-09-28 09:07:19 -07:00
README.md README: add libaio dependency 2016-01-21 10:47:55 -07:00
unittest.sh ioat: add user-mode Intel I/OAT driver 2015-12-09 10:14:15 -07:00

README.md

Storage Performance Development Kit

Build Status

SPDK on 01.org

The Storage Performance Development Kit (SPDK) provides a set of tools and libraries for writing high performance, scalable, user-mode storage applications. It achieves high performance by moving all of the necessary drivers into userspace and operating in a polled mode instead of relying on interrupts, which avoids kernel context switches and eliminates interrupt handling overhead.

Documentation

Doxygen API documentation

Porting Guide

Prerequisites

To build SPDK, some dependencies must be installed.

Fedora/CentOS:

  • gcc
  • libpciaccess-devel
  • CUnit-devel
  • libaio-devel

Ubuntu/Debian:

  • gcc
  • libpciaccess-dev
  • make
  • libcunit1-dev
  • libaio-dev

FreeBSD:

  • gcc
  • libpciaccess
  • gmake
  • cunit

Additionally, DPDK is required.

1) cd /path/to/spdk
2) wget http://dpdk.org/browse/dpdk/snapshot/dpdk-2.2.0.tar.gz
3) tar xfz dpdk-2.2.0.tar.gz
4) cd dpdk-2.2.0

Linux:

5) make install T=x86_64-native-linuxapp-gcc DESTDIR=.

FreeBSD:

5) gmake install T=x86_64-native-bsdapp-clang DESTDIR=.

Building

Once the prerequisites are installed, run 'make' within the SPDK directory to build the SPDK libraries and examples.

make DPDK_DIR=/path/to/dpdk

If you followed the instructions above for building DPDK:

Linux:

make DPDK_DIR=./dpdk-2.2.0/x86_64-native-linuxapp-gcc

FreeBSD:

gmake DPDK_DIR=./dpdk-2.2.0/x86_64-native-bsdapp-clang

Hugepages and Device Binding

Before running an SPDK application, some hugepages must be allocated and any NVMe and I/OAT devices must be unbound from the native kernel drivers. SPDK includes scripts to automate this process on both Linux and FreeBSD.

1) scripts/configure_hugepages.sh
2) scripts/unbind.sh