HP c-Class Performance Tuning manual Introduction, About the Performance and Tuning Guide

Page 5

Introduction

About the Performance and Tuning Guide

Welcome to the Performance and Tuning Guide for the HP IO Accelerator. This guide is designed to help you achieve the following objectives:

•Verify IO Accelerator performance on Linux, including using sample benchmarks and solving common performance issues.

•Verify IO Accelerator performance on Windows® operating system, including using sample benchmarks and solving common performance issues.

•Understand and use effective benchmarking techniques to study and enhance IO Accelerator performance.

•Tune your system by describing common tuning techniques applicable to many systems and applications.

•Improve your application I/O capabilities by describing programming techniques to maximize performance.

Introduction 5

Image 5

Contents HP IO Accelerator Performance Tuning Guide Page Contents Setting Windows driver affinity Introduction About the Performance and Tuning GuideVerifying Linux system performance System performanceWrite bandwidth test System performance Verifying Windows system performance with Iometer Oversubscribed bus Debugging performance issuesImproperly configured benchmark Handling PCIe errors PCIe link width improperly negotiated CPU thermal throttling or auto-idling Benchmarking through a filesystem Slow performance using RAID5 on LinuxUsing CP and other system utilities To avoid this issue. For more information, see the patch Multiple outstanding IOs General tuning techniquesUsing direct I/O, unbuffered, or zero copy $ dd if=/dev/zero of=/dev/fioX bs=10M oflag=direct Pre-conditioning$ echo 4096 /sys/block/fio name/queue/nrrequests Pre-allocating memoryPreallocatemb Increased steady-state write performance with fio-format Tuning techniques for writesExt2-3-4 tuning Linux filesystem tuningStride = chunk size / filesystem block size Stripewidth = dbd * strideOptions iomemory-vsl preallocatememory=1072,4997,6710,10345 Using the IO Accelerator as swap space$ tar xjvf fio-X.Y.Z.tar.bz2 $ cd fio-X.Y.Z Fio benchmarkCompiling the fio benchmark Page Using direct I/O on Linux Programming using direct I/OFd = openfilename, Owronly Fd = openfilename, Owronly OdirectUsing direct I/O on Windows ++ code sample Programming using direct I/O Programming using direct I/O Windows driver affinity Setting Windows driver affinityCreate the SetWorkerAffinity2 tag of type Regdword Acronyms and abbreviations Index Index