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

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OOM kills – IO system stall(RHEL4&5/x86)Free pages: 15096kB (1664kB HighMem) Active:34146 inactive:1995536 dirty:255writeback:314829 unstable:0 free:3774 slab:39266 mapped:31803 pagetables:820DMA free:12552kB min:16kB low:32kB high:48kB active:0kB inactive:0kB present:16384kBpages_scanned:2023 all_unreclaimable? yesprotections[]: 0 0 0Normal free:880kB min:928kB low:1856kB high:2784kB active:744kB inactive:660296kBpresent:901120kB pages_scanned:726099 all_unreclaimable? yesprotections[]: 0 0 0HighMem free:1664kB min:512kB low:1024kB high:1536kB active:135840kB inactive:7321848kBpresent:7995388kB pages_scanned:0 all_unreclaimable? noprotections[]: 0 0 0DMA: 2*4kB 4*8kB 2*16kB 4*32kB 3*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 2*4096kB =12552kBNormal: 0*4kB 18*8kB 14*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB= 880kBHighMem: 6*4kB 9*8kB 66*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB= 1664kBSwap cache: add 856, delete 599, find 341/403, race 0+00 bounce buffer pagesFree swap: 4193264kB2228223 pages of RAM1867481 pages of HIGHMEM150341 reserved pages343042 pages shared257 pages swap cachedkernel: Out of Memory: Killed process 3450 (hpsmhd).
Eliminating OOMkillsRHEL3●/proc/sys/vm/oomkill – number of processes that can be in anOOM kill state at any one time(default 1).RHEL4●/proc/sys/vm/oomkill – oom kill enable/disable flag(default 1).RHEL5●/proc//oom_adj – perprocess OOM adjustment(17 to +15)●●●Set to 17 to disable that process from being OOM killedDecrease to decrease OOM kill likelyhood.Increase to increase OOM kill likelyhood.●/proc//oom_score – current OOM kill priority.
Page 1 and 2:
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
Page 19 and 20:
Virtual Address Space Maps 32bit
Page 21 and 22: Linux 32bit Address Space(Hugemem
Page 23 and 24: Memory Pressure32 bitDMA Normal H
Page 25 and 26: User Memory PressureAnonymous/pagec
Page 27 and 28: PageCache/Anonymous memory split(Co
Page 29 and 30: 64bit Memory ReclamationRAMKernel
Page 31 and 32: Per Node/Zone Paging DynamicsUser A
Page 33 and 34: Buffered file system writeMemorycop
Page 35 and 36: Section 2 Analyzing System Perfo
Page 37 and 38: Red Hat Top ToolsCPU ToolsMemory To
Page 39 and 40: vmstat(paging vs swapping)vmstat 10
Page 41 and 42: 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: OOM kills - lowmem consumption(RHEL
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 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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