HP c-Class Performance Tuning manual Acronyms and abbreviations

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Acronyms and abbreviations

AIO

asynchronous input/output

CPU

central processing unit

DMA

direct memory access

DRAM

dynamic random access memory

I/O

input/output

IOPS

input/output operations per second

LBA

logical block addressing

NUMA

Non-Uniform Memory Architecture

PCIe

peripheral component interconnect express

QDR

quad data rate

SSS

solid state storage

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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 Improperly configured benchmark Debugging performance issuesOversubscribed bus Handling PCIe errors PCIe link width improperly negotiated CPU thermal throttling or auto-idling Using CP and other system utilities Slow performance using RAID5 on LinuxBenchmarking through a filesystem To avoid this issue. For more information, see the patch Using direct I/O, unbuffered, or zero copy General tuning techniquesMultiple outstanding IOs $ 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 writesStripewidth = dbd * stride Linux filesystem tuningExt2-3-4 tuning Stride = chunk size / filesystem block sizeOptions iomemory-vsl preallocatememory=1072,4997,6710,10345 Using the IO Accelerator as swap spaceCompiling the fio benchmark Fio benchmark$ tar xjvf fio-X.Y.Z.tar.bz2 $ cd fio-X.Y.Z Page Fd = openfilename, Owronly Odirect Programming using direct I/OUsing direct I/O on Linux Fd = openfilename, OwronlyUsing 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