HP c-Class Performance Tuning manual Setting Windows driver affinity

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Setting Windows driver affinity	....................................................................................................................29
Acronyms and abbreviations	31
Index	32

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Contents HP IO Accelerator Performance Tuning Guide Page Contents Setting Windows driver affinity About the Performance and Tuning Guide IntroductionSystem performance Verifying Linux 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 Pre-conditioning $ dd if=/dev/zero of=/dev/fioX bs=10M oflag=directPre-allocating memory $ echo 4096 /sys/block/fio name/queue/nrrequestsPreallocatemb Tuning techniques for writes Increased steady-state write performance with fio-formatLinux filesystem tuning Ext2-3-4 tuningStride = chunk size / filesystem block size Stripewidth = dbd * strideUsing the IO Accelerator as swap space Options iomemory-vsl preallocatememory=1072,4997,6710,10345Compiling the fio benchmark Fio benchmark$ tar xjvf fio-X.Y.Z.tar.bz2 $ cd fio-X.Y.Z Page Programming using direct I/O Using direct I/O on LinuxFd = openfilename, Owronly Fd = openfilename, Owronly OdirectUsing direct I/O on Windows ++ code sample Programming using direct I/O Programming using direct I/O Setting Windows driver affinity Windows driver affinityCreate the SetWorkerAffinity2 tag of type Regdword Acronyms and abbreviations Index Index