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

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Asynchronous I/O to File Systems Allows application to continue processing while I/Synchronous I/OO is in progress●●Eliminates Synchronous I/O stallCritical for I/O intensive server applicationsStall forcompletionApp I/ORequestDeviceDriverI/O RequestIssue Red Hat Enterprise Linux – since 2002I/O●Support for RAW devices onlyApplicationI/O RequestCompletionWith Red Hat Enterprise Linux 4, significantimprovement:Asynchronous I/O●●Support for Ext3, NFS, GFS file systemaccessSupports Direct I/O (e.g. DatabaseNo stall forcompletionApp I/ORequestDeviceDriverI/O RequestIssueapplications)I/O●Makes benchmark results more appropriatefor realworld comparisonsI/OCompletionI/O RequestCompletionApplicationRed Hat Confidential
Asynchronous I/O CharacteristicsR4 U4 FC AIO ReadR4 U4 FC AIO Write Perf160180140160MB/sec120100806040204k8k16k32k64kMB/sec140120100806040204k8k16k32k64k01 2 4 8 16 32 64aios01 2 4 8 16 32 64aios
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RHEL Kernel Performance Optimizatio
Page 3 and 4:
Section 1 System Overview Proces
Page 5 and 6:
Processor typesUniProcessorSymmet
Page 7 and 8:
AMD64 System Numa Memory LayoutS1S2
Page 9:
Physical Memory Supported/TestedRHE
Page 13 and 14:
IncomesExpendituresDonkey owned 0.7
Page 15 and 16:
Perzone page lists Active List
Page 17 and 18:
Per NUMANode ResourcesMemory zone
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Virtual Address Space Maps 32bit
Page 21 and 22:
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
Page 29 and 30:
64bit Memory ReclamationRAMKernel
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Per Node/Zone Paging DynamicsUser A
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Buffered file system writeMemorycop
Page 35 and 36:
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
Page 43 and 44:
free/numastat - memory allocation[r
Page 45 and 46: 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: Linux at 16cpus quadcore and b
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 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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