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

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Performance Tuning – DISK RHEL3[root@dhcp8336 sysctl]# /sbin/elvtune /dev/hda/dev/hda elevator ID 0read_latency: 2048write_latency: 8192max_bomb_segments: 6[root@dhcp8336 sysctl]# /sbin/elvtune r 1024 w 2048 /dev/hda/dev/hda elevator ID 0read_latency: 1024write_latency: 2048max_bomb_segments: 6
Disk IO tuning RHEL4/5RHEL4/5 – 4 tunable I/O Schedulers●●●●CFQ – elevator=cfq. Completely Fair Queuing default, balanced, fair formultiple luns, adaptors, smp serversNOOP – elevator=noop. Nooperation in kernel, simple, low cpuoverhead, leave opt to ramdisk, raid cntrl etc.Deadline – elevator=deadline. Optimize for runtimelike behavior, lowlatency per IO, balance issues with large IO luns/controllers (NOTE:current best for FC5)Anticipatory – elevator=as. Inserts delays to help stack aggregate IO,best on system w/ limited physical IO – SATARHEL4 Set at boot time on command lineRHEL5 – Change on the fly
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RHEL Kernel Performance Optimizatio
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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
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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
Page 47 and 48: The /proc filesystem /proc●meminf
Page 49 and 50: proc/slabinfoslabinfo version: 2
Page 51 and 52: 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: Asynchronous I/O CharacteristicsR4
Page 101 and 102: Optimizing File System PerformanceU
Page 103 and 104: McCalpin Streams Copy Bandwidth (1,
Page 105 and 106: RHEL4&5 NUMAstat and NUMActlEXAMPLE
Page 107 and 108: RHEL5.2 CPUspeed and performance:En
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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