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

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OOM kills – lowmem consumption(<strong>RHEL</strong>3/x86)Meminfo:zone:DMA freepages: 2029 min: 0 low: 0 high: 0Zone:Normal freepages: 1249 min: 1279 low: 4544 high: 6304Zone:HighMem freepages: 746 min: 255 low: 29184 high: 43776Free pages: 4024 ( 746 HighMem)( Active: 703448/665000, inactive_laundry: 99878, inactive_clean: 99730, free: 4024 )aa:0 ac:0 id:0 il:0 ic:0 fr:2029aa:128 ac:3346 id:113 il:240 ic:0 fr:1249aa:545577 ac:154397 id:664813 il:99713 ic:99730 fr:7461*4kB 0*8kB 1*16kB 1*32kB 0*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 1*4096kB = 8116 kB)543*4kB 35*8kB 77*16kB 1*32kB 0*64kB 0*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 0*4096kB = 4996kB)490*4kB 2*8kB 1*16kB 1*32kB 1*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 29 84kB)Swap cache: add 4327, delete 4173, find 190/1057, race 0+0178558 pages of slabcache1078 pages of kernel stacks0 lowmem pagetables, 233961 highmem pagetablesFree swap:8189016kB2097152 pages of RAM1801952 pages of HIGHMEM103982 reserved pages115582774 pages shared154 pages swap cachedOut of Memory: Killed process 27100 (oracle).
OOM kills – lowmem consumption(<strong>RHEL</strong>4&5/x86)Free pages: 9003696kB (8990400kB HighMem)Active:323264 inactive:346882 dirty:327575 writeback:3686 unstable:0 free:2250924 slab:177094mapped:15855 pagetables:987DMA free:12640kB min:16kB low:32kB high:48kB active:0kB inactive:0kB present:16384kBpages_scanned:149 all_unreclaimable? yesprotections[]: 0 0 0Normal free:656kB min:928kB low:1856kB high:2784kB active:6976kB inactive:9976kB present:901120kBpages_scanned:28281 all_unreclaimable? yesprotections[]: 0 0 0HighMem free:8990400kB min:512kB low:1024kB high:1536kB active:1286080kB inactive:1377552kBpresent:12451840kB pages_scanned:0 all_unreclaimable? noprotections[]: 0 0 0DMA: 4*4kB 4*8kB 3*16kB 4*32kB 4*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 2*4096kB = 12640kBNormal: 0*4kB 2*8kB 0*16kB 0*32kB 0*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 656kBHighMem: 15994*4kB 17663*8kB 11584*16kB 8561*32kB 8193*64kB 1543*128kB 69*256kB 2101*512kB1328*1024kB 765*2048kB 875*4096kB = 8990400kBSwap cache: add 0, delete 0, find 0/0, race 0+0Free swap: 8385912kB3342336 pages of RAM2916288 pages of HIGHMEM224303 reserved pages666061 pages shared0 pages swap cachedOut of Memory: Killed process 22248 (httpd).oomkiller: gfp_mask=0xd0
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: OOM kills - swap space exhaustion(R
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 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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