HP c-Class Performance Tuning manual

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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 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 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-formatStride = chunk size / filesystem block size Linux filesystem tuningExt2-3-4 tuning Stripewidth = dbd * strideUsing the IO Accelerator as swap space Options iomemory-vsl preallocatememory=1072,4997,6710,10345$ tar xjvf fio-X.Y.Z.tar.bz2 $ cd fio-X.Y.Z Fio benchmarkCompiling the fio benchmark Page Fd = openfilename, Owronly Programming using direct I/OUsing direct I/O on Linux 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