Linux 2.6.31.2-test fs=btrfs disk=areca RAID6 scheduler=cfq ************************************************************************************** 1 readers (30s) ---------------------------------------------------------------------- A read dir cnt 85066 min 0.001 ms max 21.110 ms avg 0.017 ms med 0.002 ms std 0.277 B lstat file cnt 79415 min 0.006 ms max 15.294 ms avg 0.032 ms med 0.025 ms std 0.205 C open file cnt 62465 min 0.013 ms max 0.169 ms avg 0.017 ms med 0.016 ms std 0.003 D rd 1st byte cnt 62465 min 0.013 ms max 129.992 ms avg 0.197 ms med 0.126 ms std 1.006 E read rate 186.521 MB/s (data) 68.739 MB/s (readdir + open + 1st byte + data) 3 readers (30s) ---------------------------------------------------------------------- A read dir cnt 37615 min 0.001 ms max 360.422 ms avg 0.069 ms med 0.003 ms std 2.160 B lstat file cnt 35080 min 0.006 ms max 185.317 ms avg 0.080 ms med 0.026 ms std 1.354 C open file cnt 27478 min 0.014 ms max 0.087 ms avg 0.018 ms med 0.016 ms std 0.004 D rd 1st byte cnt 27478 min 0.014 ms max 3800.095 ms avg 0.591 ms med 0.151 ms std 23.509 E read rate 123.757 MB/s (data) 28.708 MB/s (readdir + open + 1st byte + data) 3 readers, 3 writers (30s) ---------------------------------------------------------------------- F write open cnt 59 min 0.062 ms max 1582.177 ms avg 30.292 ms med 0.078 ms std 205.397 G wr 1st byte cnt 59 min 0.006 ms max 0.024 ms avg 0.008 ms med 0.007 ms std 0.003 H write close cnt 59 min 0.017 ms max 7891.187 ms avg 133.817 ms med 0.023 ms std 1018.593 I mkdir cnt 3 min 0.048 ms max 0.085 ms avg 0.066 ms med 0.065 ms std 0.015 J write rate 0.166 MB/s (data) 0.095 MB/s (open + 1st byte + data + close) A read dir cnt 379 min 0.001 ms max 80.234 ms avg 0.550 ms med 0.003 ms std 5.897 B lstat file cnt 368 min 0.007 ms max 1045.276 ms avg 12.162 ms med 0.032 ms std 77.800 C open file cnt 331 min 0.015 ms max 0.408 ms avg 0.021 ms med 0.018 ms std 0.023 D rd 1st byte cnt 331 min 0.021 ms max 5449.247 ms avg 87.907 ms med 0.310 ms std 509.153 E read rate 6.697 MB/s (data) 0.360 MB/s (readdir + open + 1st byte + data) Linux 2.6.31.2-test fs=btrfs disk=areca RAID6 scheduler=deadline ************************************************************************************** 1 readers (30s) ---------------------------------------------------------------------- A read dir cnt 60217 min 0.001 ms max 58.315 ms avg 0.024 ms med 0.003 ms std 0.523 B lstat file cnt 56208 min 0.006 ms max 58.272 ms avg 0.035 ms med 0.026 ms std 0.344 C open file cnt 44180 min 0.014 ms max 0.171 ms avg 0.017 ms med 0.016 ms std 0.003 D rd 1st byte cnt 44180 min 0.019 ms max 249.017 ms avg 0.326 ms med 0.148 ms std 3.303 E read rate 133.265 MB/s (data) 45.363 MB/s (readdir + open + 1st byte + data) 3 readers (30s) ---------------------------------------------------------------------- A read dir cnt 25157 min 0.001 ms max 468.046 ms avg 0.096 ms med 0.003 ms std 4.513 B lstat file cnt 23481 min 0.006 ms max 519.147 ms avg 0.129 ms med 0.027 ms std 4.717 C open file cnt 18429 min 0.013 ms max 0.120 ms avg 0.017 ms med 0.016 ms std 0.003 D rd 1st byte cnt 18429 min 0.020 ms max 3238.421 ms avg 0.999 ms med 0.156 ms std 27.290 E read rate 111.072 MB/s (data) 19.010 MB/s (readdir + open + 1st byte + data) 3 readers, 3 writers (30s) ---------------------------------------------------------------------- F write open cnt 172 min 0.063 ms max 41.425 ms avg 0.350 ms med 0.072 ms std 3.162 G wr 1st byte cnt 172 min 0.006 ms max 0.083 ms avg 0.008 ms med 0.007 ms std 0.006 H write close cnt 172 min 0.018 ms max 19.476 ms avg 0.135 ms med 0.022 ms std 1.479 I mkdir cnt 11 min 0.036 ms max 257.869 ms avg 23.499 ms med 0.061 ms std 74.114 J write rate 0.364 MB/s (data) 0.361 MB/s (open + 1st byte + data + close) A read dir cnt 3142 min 0.001 ms max 481.434 ms avg 0.825 ms med 0.003 ms std 15.208 B lstat file cnt 2930 min 0.007 ms max 354.665 ms avg 0.624 ms med 0.029 ms std 12.068 C open file cnt 2294 min 0.014 ms max 0.268 ms avg 0.018 ms med 0.017 ms std 0.008 D rd 1st byte cnt 2294 min 0.021 ms max 2293.042 ms avg 9.787 ms med 0.179 ms std 78.805 E read rate 8.927 MB/s (data) 1.911 MB/s (readdir + open + 1st byte + data) Linux 2.6.31.2-test nobarrier fs=btrfs disk=areca RAID6 scheduler=cfq ************************************************************************************** 1 readers (30s) ---------------------------------------------------------------------- A read dir cnt 87133 min 0.001 ms max 19.047 ms avg 0.020 ms med 0.003 ms std 0.349 B lstat file cnt 81349 min 0.006 ms max 32.409 ms avg 0.034 ms med 0.023 ms std 0.262 C open file cnt 63997 min 0.013 ms max 0.128 ms avg 0.016 ms med 0.016 ms std 0.003 D rd 1st byte cnt 63997 min 0.013 ms max 24.931 ms avg 0.175 ms med 0.121 ms std 0.642 E read rate 181.640 MB/s (data) 71.359 MB/s (readdir + open + 1st byte + data) 3 readers (30s) ---------------------------------------------------------------------- A read dir cnt 52157 min 0.001 ms max 61.196 ms avg 0.051 ms med 0.003 ms std 0.757 B lstat file cnt 48669 min 0.006 ms max 22.695 ms avg 0.062 ms med 0.026 ms std 0.504 C open file cnt 38205 min 0.013 ms max 0.130 ms avg 0.017 ms med 0.016 ms std 0.004 D rd 1st byte cnt 38205 min 0.014 ms max 41.009 ms avg 0.349 ms med 0.144 ms std 1.313 E read rate 132.131 MB/s (data) 40.885 MB/s (readdir + open + 1st byte + data) 3 readers, 3 writers (30s) ---------------------------------------------------------------------- F write open cnt 20 min 0.065 ms max 35.891 ms avg 1.951 ms med 0.126 ms std 7.789 G wr 1st byte cnt 20 min 0.006 ms max 0.018 ms avg 0.009 ms med 0.008 ms std 0.003 H write close cnt 20 min 0.018 ms max 1848.102 ms avg 168.527 ms med 2.059 ms std 408.952 I mkdir cnt 6 min 0.035 ms max 0.085 ms avg 0.051 ms med 0.048 ms std 0.018 J write rate 0.036 MB/s (data) 0.028 MB/s (open + 1st byte + data + close) A read dir cnt 3774 min 0.001 ms max 157.739 ms avg 0.134 ms med 0.003 ms std 3.215 B lstat file cnt 3536 min 0.007 ms max 752.500 ms avg 2.737 ms med 0.029 ms std 27.926 C open file cnt 2821 min 0.015 ms max 0.119 ms avg 0.018 ms med 0.017 ms std 0.005 D rd 1st byte cnt 2821 min 0.021 ms max 2406.329 ms avg 7.716 ms med 0.149 ms std 85.023 E read rate 9.633 MB/s (data) 2.480 MB/s (readdir + open + 1st byte + data) Linux 2.6.31.2-test nobarrier fs=btrfs disk=areca RAID6 scheduler=deadline ************************************************************************************** 1 readers (30s) ---------------------------------------------------------------------- A read dir cnt 85597 min 0.001 ms max 17.321 ms avg 0.017 ms med 0.003 ms std 0.300 B lstat file cnt 79910 min 0.006 ms max 23.966 ms avg 0.033 ms med 0.023 ms std 0.256 C open file cnt 62849 min 0.013 ms max 0.175 ms avg 0.017 ms med 0.016 ms std 0.003 D rd 1st byte cnt 62849 min 0.013 ms max 34.318 ms avg 0.177 ms med 0.124 ms std 0.637 E read rate 169.768 MB/s (data) 69.736 MB/s (readdir + open + 1st byte + data) 3 readers (30s) ---------------------------------------------------------------------- A read dir cnt 51785 min 0.001 ms max 38.732 ms avg 0.055 ms med 0.003 ms std 0.799 B lstat file cnt 48315 min 0.006 ms max 32.690 ms avg 0.061 ms med 0.025 ms std 0.531 C open file cnt 37899 min 0.013 ms max 0.121 ms avg 0.018 ms med 0.016 ms std 0.004 D rd 1st byte cnt 37899 min 0.014 ms max 39.771 ms avg 0.355 ms med 0.140 ms std 1.332 E read rate 134.270 MB/s (data) 40.290 MB/s (readdir + open + 1st byte + data) 3 readers, 3 writers (30s) ---------------------------------------------------------------------- F write open cnt 408 min 0.060 ms max 151.418 ms avg 0.488 ms med 0.078 ms std 7.492 G wr 1st byte cnt 408 min 0.006 ms max 0.016 ms avg 0.007 ms med 0.007 ms std 0.001 H write close cnt 408 min 0.016 ms max 7313.379 ms avg 17.950 ms med 0.023 ms std 361.621 I mkdir cnt 41 min 0.035 ms max 538.118 ms avg 13.561 ms med 0.052 ms std 82.959 J write rate 0.441 MB/s (data) 0.361 MB/s (open + 1st byte + data + close) A read dir cnt 1732 min 0.001 ms max 374.819 ms avg 0.931 ms med 0.003 ms std 15.017 B lstat file cnt 1614 min 0.007 ms max 1741.201 ms avg 3.227 ms med 0.028 ms std 48.921 C open file cnt 1265 min 0.014 ms max 0.508 ms avg 0.019 ms med 0.017 ms std 0.015 D rd 1st byte cnt 1265 min 0.015 ms max 3518.940 ms avg 22.466 ms med 0.150 ms std 167.312 E read rate 2.969 MB/s (data) 0.790 MB/s (readdir + open + 1st byte + data)