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gerrit-public.fairphone.software / fp2-dev / platform / external / fio / c3a1b740381cb19e467c8588562bac4d6cbbb199
commitc3a1b740381cb19e467c8588562bac4d6cbbb199[log] [tgz]
authorSEOKYOUNG KO <seokyoung.ko@samsung.com>Thu Mar 07 12:34:31 2013 +0100
committerJens Axboe <axboe@kernel.dk>Thu Mar 07 12:34:31 2013 +0100
tree176475605c478091ec9f247b291246e7ef109270
parent5b3faae6f26beb2572ebeae7caf8cd7d693bb818 [diff]
Fix skewed latencies for rate IOPS

- when -rate_iops is specified, FIO periodically calls usleep() to limit IOPS

- Before usleep(), FIO always wait until the completion of all pending I/O

- For all I/O completions, FIO shows erroneous behavior of logging their
  latency, with that of the longest latency IO sample.

- w/ QD=8/ mixed R:W=33:66, up to 7 samples may get false latency log when
  waiting all I/O completions => False report of latency distribution

Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed
tree: 176475605c478091ec9f247b291246e7ef109270
  1. arch/
  2. compiler/
  3. crc/
  4. engines/
  5. examples/
  6. lib/
  7. os/
  8. profiles/
  9. t/
  10. .gitignore
  11. backend.c
  12. blktrace.c
  13. blktrace_api.h
  14. cgroup.c
  15. cgroup.h
  16. client.c
  17. configure
  18. COPYING
  19. debug.c
  20. debug.h
  21. diskutil.c
  22. diskutil.h
  23. eta.c
  24. fifo.c
  25. fifo.h
  26. file.h
  27. filehash.c
  28. filehash.h
  29. filesetup.c
  30. FIO-VERSION-GEN
  31. fio.1
  32. fio.c
  33. fio.h
  34. fio_generate_plots
  35. fio_generate_plots.1
  36. flist.h
  37. flow.c
  38. flow.h
  39. gettime-thread.c
  40. gettime.c
  41. gettime.h
  42. hash.h
  43. helpers.c
  44. helpers.h
  45. HOWTO
  46. idletime.c
  47. idletime.h
  48. init.c
  49. io_ddir.h
  50. io_u.c
  51. ioengine.h
  52. ioengines.c
  53. iolog.c
  54. iolog.h
  55. json.c
  56. json.h
  57. libfio.c
  58. LICENSE
  59. log.c
  60. log.h
  61. Makefile
  62. memalign.c
  63. memalign.h
  64. memory.c
  65. minmax.h
  66. mutex.c
  67. mutex.h
  68. options.c
  69. options.h
  70. parse.c
  71. parse.h
  72. profile.c
  73. profile.h
  74. rbtree.c
  75. rbtree.h
  76. README
  77. REPORTING-BUGS
  78. SERVER-TODO
  79. server.c
  80. server.h
  81. smalloc.c
  82. smalloc.h
  83. stat.c
  84. stat.h
  85. time.c
  86. time.h
  87. trim.c
  88. trim.h
  89. verify.c
  90. verify.h