RHEL Kernel Performance Optimization, Characterization ... - Red Hat

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Linux NUMA EvolutionRHEL3, 4 and 5 Linpack MultistreamAMD64, 8cpu dualcore (1/2 cpus loaded)300000045Performance in Kflops2500000200000015000001000000500000403530252015105Default SchedulerTaskset AffinityColumn E0 Limitations :RHEL3U8 RHEL4U5 RHEL5GOLD0●●●Numa “spill” to different numa boundariesProcess migrations – no way backLack of page replication – text, read mostly
RHEL5.2 CPUspeed and performance:Enabled = governor set to “ondemand”Looks at cpu usage to regulate power●Within 35% of performance for cpu loads●IO loads can keep cpu stepped down 1530%Supported in RHEL5.2 virtualizationTo turn off – else may leave cpu’s in reduced step●If its not using performance, then:●# echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor●Then check to see if it stuck:●# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor●Check /proc/cpuinfo to make sure your seeing the expected CPU freq.Proceed to “normal” service disable●●Service cpuspeed stopChkconfig cpuspeed off
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RHEL Kernel Performance Optimizatio
Page 3 and 4:
Section 1 System Overview Proces
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Processor typesUniProcessorSymmet
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AMD64 System Numa Memory LayoutS1S2
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Physical Memory Supported/TestedRHE
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IncomesExpendituresDonkey owned 0.7
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Perzone page lists Active List
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Per NUMANode ResourcesMemory zone
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Virtual Address Space Maps 32bit
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Linux 32bit Address Space(Hugemem
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Memory Pressure32 bitDMA Normal H
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User Memory PressureAnonymous/pagec
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PageCache/Anonymous memory split(Co
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64bit Memory ReclamationRAMKernel
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Per Node/Zone Paging DynamicsUser A
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Buffered file system writeMemorycop
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Section 2 Analyzing System Perfo
Page 37 and 38:
Red Hat Top ToolsCPU ToolsMemory To
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vmstat(paging vs swapping)vmstat 10
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iostat x of same IOzone EXT3 file
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free/numastat - memory allocation[r
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pstreeinit ─┬─/usr/bin/sealer
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The /proc filesystem /proc●meminf
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proc/slabinfoslabinfo version: 2
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32bit /proc//maps[root@dhcp8336
Page 53 and 54:
proc/vmstat(RHEL4/RHEL5)cat /proc/v
Page 55 and 56: Alt Sysrq M - RHEL3/NUMASysRq : Sho
Page 57 and 58: Alt Sysrq M - RHEL4 & 5/NUMAFree pa
Page 59 and 60: Alt Sysrq W and PSysRq : Show CPUsC
Page 61 and 62: oprofile - opcontrol and opreport c
Page 63 and 64: Profiling Tools: SystemTapTechnolog
Page 65 and 66: New Tuning Tools w/ RH MRGMRG Tunin
Page 67 and 68: Tuning how to set kernel paramet
Page 69 and 70: OOM kills - swap space exhaustion(R
Page 71 and 72: OOM kills - lowmem consumption(RHEL
Page 73 and 74: Eliminating OOMkillsRHEL3●/proc/s
Page 75 and 76: Performance Tuning - (RHEL3) /proc/
Page 77 and 78: RHEL3 /proc/sys/vm/pagecachepagecac
Page 79 and 80: Performance Tuning - (RHEL4 and RHE
Page 81 and 82: RHEL4&5 /proc/sys/vm/min_free_kbyte
Page 83 and 84: RHEL4&5 /proc/sys/vm/dirty_ratioAbs
Page 85 and 86: dirty_ratio and dirty_background_ra
Page 87 and 88: Pagecache TuningFilesystem/pagecach
Page 89 and 90: (Hint)flushing the slabcache[tmp]#
Page 91 and 92: x86●RHEL4 kernel selectionStandar
Page 93 and 94: Problem 16GB x86 running SMP ker
Page 95 and 96: Linux at 16cpus quadcore and b
Page 97 and 98: Asynchronous I/O CharacteristicsR4
Page 99 and 100: Disk IO tuning RHEL4/5RHEL4/5 -
Page 101 and 102: Optimizing File System PerformanceU
Page 103 and 104: McCalpin Streams Copy Bandwidth (1,
Page 105: RHEL4&5 NUMAstat and NUMActlEXAMPLE
Page 109 and 110: Effects of CPUspeed with RHEL5.2 Vi
Page 111 and 112: EXT3, GFS, NFS Iozone w/ DirectIORH
Page 113 and 114: Using HugeTLBfs w/ DatabasesRHEL4+5
Page 115 and 116: Tuning Network Apps Messages/sec Di
Page 117 and 118: RT Peformance of Network Apps Messa
Page 119 and 120: General Performance Tuning Guidelin
Page 121 and 122: Linux Performance Tuning References
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RHEL Kernel Performance Optimization, Characterization ... - Red Hat

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