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  1. === linux-next ===
  2. ==== clang-11 ====
  3. Performance counter stats for 'make O=obj-x86/ CC=clang-11 ARCH=x86 -skj30 vmlinux':
  4.  
  5. 6939594.65 msec task-clock # 28.094 CPUs utilized
  6. 1360491 context-switches # 0.196 K/sec
  7. 272329 cpu-migrations # 0.039 K/sec
  8. 137819394 page-faults # 0.020 M/sec
  9. 23918068225290 cycles # 3.447 GHz (83.32%)
  10. 2585450437659 stalled-cycles-frontend # 10.81% frontend cycles idle (83.34%)
  11. 1689540037031 stalled-cycles-backend # 7.06% backend cycles idle (83.35%)
  12. 19984536976171 instructions # 0.84 insn per cycle
  13. # 0.13 stalled cycles per insn (83.33%)
  14. 3709186514733 branches # 534.496 M/sec (83.33%)
  15. 134033360958 branch-misses # 3.61% of all branches (83.33%)
  16.  
  17. 247.015112834 seconds time elapsed
  18.  
  19. 6280.106515000 seconds user
  20. 655.367043000 seconds sys
  21.  
  22. ==== gcc-9 ====
  23. Performance counter stats for 'make O=obj-x86/ CC=gcc-9 ARCH=x86 -skj30 vmlinux':
  24.  
  25. 4191482.92 msec task-clock # 25.773 CPUs utilized
  26. 1070888 context-switches # 0.255 K/sec
  27. 301454 cpu-migrations # 0.072 K/sec
  28. 127252110 page-faults # 0.030 M/sec
  29. 15172784746480 cycles # 3.620 GHz (83.33%)
  30. 2337100843963 stalled-cycles-frontend # 15.40% frontend cycles idle (83.34%)
  31. 929020597083 stalled-cycles-backend # 6.12% backend cycles idle (83.31%)
  32. 8702058248778 instructions # 0.57 insn per cycle
  33. # 0.27 stalled cycles per insn (83.34%)
  34. 1847469683055 branches # 440.768 M/sec (83.36%)
  35. 71262264566 branch-misses # 3.86% of all branches (83.33%)
  36.  
  37. 162.627761031 seconds time elapsed
  38.  
  39. 3501.353724000 seconds user
  40. 689.287415000 seconds sys
  41.  
  42. === Marco's patch ===
  43. ==== clang-11 ====
  44. Performance counter stats for 'make O=obj-x86/ CC=clang-11 ARCH=x86 -skj30 vmlinux':
  45.  
  46. 5399261.82 msec task-clock # 27.626 CPUs utilized
  47. 1259212 context-switches # 0.233 K/sec
  48. 291439 cpu-migrations # 0.054 K/sec
  49. 119640530 page-faults # 0.022 M/sec
  50. 18877912393019 cycles # 3.496 GHz (83.32%)
  51. 2325051933195 stalled-cycles-frontend # 12.32% frontend cycles idle (83.34%)
  52. 1307904861845 stalled-cycles-backend # 6.93% backend cycles idle (83.35%)
  53. 11082939508155 instructions # 0.59 insn per cycle
  54. # 0.21 stalled cycles per insn (83.35%)
  55. 2144742102371 branches # 397.229 M/sec (83.33%)
  56. 120725694267 branch-misses # 5.63% of all branches (83.32%)
  57.  
  58. 195.443844981 seconds time elapsed
  59.  
  60. 4803.792808000 seconds user
  61. 593.572707000 seconds sys
  62.  
  63.  
  64. ==== gcc-9 ====
  65. Performance counter stats for 'make O=obj-x86/ CC=gcc-9 ARCH=x86 -skj30 vmlinux':
  66.  
  67. 3800409.58 msec task-clock # 25.544 CPUs utilized
  68. 1058361 context-switches # 0.278 K/sec
  69. 316668 cpu-migrations # 0.083 K/sec
  70. 111454008 page-faults # 0.029 M/sec
  71. 13430341673504 cycles # 3.534 GHz (83.30%)
  72. 2105896659854 stalled-cycles-frontend # 15.68% frontend cycles idle (83.32%)
  73. 826088367761 stalled-cycles-backend # 6.15% backend cycles idle (83.32%)
  74. 7171501244211 instructions # 0.53 insn per cycle
  75. # 0.29 stalled cycles per insn (83.38%)
  76. 1518279256918 branches # 399.504 M/sec (83.38%)
  77. 65629172752 branch-misses # 4.32% of all branches (83.30%)
  78.  
  79. 148.779676837 seconds time elapsed
  80.  
  81. 3171.670068000 seconds user
  82. 629.108738000 seconds sys
  83.  
  84.  
  85.  
  86. === Arnd's patch ==
  87. ==== clang-11 ====
  88. Performance counter stats for 'make O=obj-x86/ CC=clang-11 ARCH=x86 -skj30 vmlinux':
  89.  
  90. 5273888.54 msec task-clock # 27.729 CPUs utilized
  91. 1182922 context-switches # 0.224 K/sec
  92. 280754 cpu-migrations # 0.053 K/sec
  93. 118027390 page-faults # 0.022 M/sec
  94. 18516593810157 cycles # 3.511 GHz (83.33%)
  95. 2376622014752 stalled-cycles-frontend # 12.84% frontend cycles idle (83.35%)
  96. 1258717012911 stalled-cycles-backend # 6.80% backend cycles idle (83.36%)
  97. 10220483279629 instructions # 0.55 insn per cycle
  98. # 0.23 stalled cycles per insn (83.32%)
  99. 1989025061785 branches # 377.146 M/sec (83.32%)
  100. 115670021939 branch-misses # 5.82% of all branches (83.32%)
  101.  
  102. 190.196355129 seconds time elapsed
  103.  
  104. 4656.304209000 seconds user
  105. 615.994556000 seconds sys
  106.  
  107. ==== gcc-9 ====
  108. Performance counter stats for 'make O=obj-x86/ CC=gcc-9 ARCH=x86 -skj30 vmlinux':
  109.  
  110. 3584550.23 msec task-clock # 27.298 CPUs utilized
  111. 934300 context-switches # 0.261 K/sec
  112. 261147 cpu-migrations # 0.073 K/sec
  113. 105570888 page-faults # 0.029 M/sec
  114. 12887715815439 cycles # 3.595 GHz (83.32%)
  115. 2050293516826 stalled-cycles-frontend # 15.91% frontend cycles idle (83.35%)
  116. 787395584674 stalled-cycles-backend # 6.11% backend cycles idle (83.35%)
  117. 6774827714341 instructions # 0.53 insn per cycle
  118. # 0.30 stalled cycles per insn (83.33%)
  119. 1434938818797 branches # 400.312 M/sec (83.33%)
  120. 62391821690 branch-misses # 4.35% of all branches (83.31%)
  121.  
  122. 131.309786013 seconds time elapsed
  123.  
  124. 2980.462339000 seconds user
  125. 603.639756000 seconds sys
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