On Tue, 19 July 2011 23:19:58 +1000, Dave Chinner wrote: > On Sun, Jul 17, 2011 at 06:05:01PM +0200, Jörn Engel wrote: > > xfs: > > ==== > ..... > > seqwr 1 2 4 8 16 32 64 128 > > 16384 39956 39695 39971 39913 37042 37538 36591 32179 > > 8192 67934 66073 30963 29038 29852 25210 23983 28272 > > 4096 89250 81417 28671 18685 12917 14870 22643 22237 > > 2048 140272 120588 140665 140012 137516 139183 131330 129684 > > 1024 217473 147899 210350 218526 219867 220120 219758 215166 > > 512 328260 181197 211131 263533 294009 298203 301698 298013 > > OK, I can explain the pattern here where throughput drops off at 2-4 > threads. It's not as simple as the seqrd case, but it's related to > the fact that this workload is an append write workload. See the > patch description below for why that matters. > > As it is, the numbers I get for 16k seqwr on my hardawre are as > follows: > > seqwr 1 2 4 8 16 > vanilla 3072 2734 2506 not tested... > patched 2984 4156 4922 5175 5120 > > Looks like my hardware is topping out at ~5-6kiops no matter the > block size here. Which, no matter how you look at it, is a > significant improvement. ;) My numbers include some regressions, although the improvements clearly dominate. Below is a diff (or div) between new kernel with both your patches applied and vanilla. >1 means improvement, <1 means regression. seqrd 1 2 4 8 16 32 64 128 16384 1.037 1.975 3.726 6.643 8.901 8.902 8.431 8.365 8192 1.015 1.871 3.459 6.424 11.457 12.829 13.542 13.490 4096 1.009 1.790 2.942 5.179 9.634 16.667 17.652 17.666 2048 1.005 1.709 2.525 4.196 7.479 14.022 22.032 22.100 1024 1.017 1.624 2.328 3.587 6.112 11.365 20.311 21.315 512 1.012 1.829 2.374 3.365 5.352 9.459 16.809 18.771 rndrd 1 2 4 8 16 32 64 128 16384 1.042 1.037 1.036 1.043 1.051 1.011 1.002 1.001 8192 1.020 1.020 1.028 1.040 1.057 1.064 1.002 1.001 4096 1.011 1.007 1.021 1.036 1.059 1.086 1.021 1.001 2048 1.002 1.010 1.018 1.025 1.057 1.100 1.098 1.003 1024 1.001 1.002 1.023 1.007 1.072 1.112 1.162 1.102 512 0.998 1.010 1.004 1.035 1.088 1.121 1.156 1.127 seqwr 1 2 4 8 16 32 64 128 16384 0.942 0.949 0.942 0.945 1.017 1.004 1.030 1.172 8192 1.144 1.177 2.517 2.687 2.611 3.091 3.246 2.741 4096 1.389 1.506 4.228 6.443 9.313 8.064 5.276 5.394 2048 1.139 1.278 1.080 1.076 1.094 1.087 1.142 1.148 1024 0.852 1.190 0.806 0.783 0.776 0.774 0.769 0.774 512 0.709 1.273 1.055 0.847 0.758 0.744 0.738 0.746 rndwr 1 2 4 8 16 32 64 128 16384 1.013 1.003 1.002 1.005 1.007 1.006 1.003 1.002 8192 1.023 1.005 1.007 1.006 1.006 1.004 1.004 1.006 4096 1.020 1.007 1.007 1.007 1.007 1.007 1.008 1.007 2048 0.901 1.017 1.007 1.008 1.008 1.009 1.008 1.007 1024 0.848 0.949 1.003 0.990 1.001 1.006 1.006 1.005 512 0.821 0.833 0.948 0.956 0.935 0.929 0.921 0.914 Raw results: seqrd 1 2 4 8 16 32 64 128 16384 4873 8738 16382 29241 39111 39152 39137 39140 8192 6326 10900 20054 37263 66391 78437 78449 78404 4096 9181 15816 26130 46073 85492 148172 157276 157329 2048 14995 24588 36009 59790 106685 200012 314373 315440 1024 24248 36841 51972 80207 136529 253175 451709 475353 512 37813 62164 79048 112175 178246 314959 558458 624534 rndrd 1 2 4 8 16 32 64 128 16384 4778 8554 14724 23507 33666 39065 39109 39104 8192 6152 11409 20862 35814 56123 75776 78370 78380 4096 8335 15643 29662 53953 91867 136643 157314 157325 2048 11973 22885 43474 81545 148087 239997 314198 315680 1024 16547 31345 61123 113283 222737 387234 562457 632767 512 20590 40134 73333 135621 294448 543117 793329 818861 seqwr 1 2 4 8 16 32 64 128 16384 37629 37651 37667 37711 37658 37674 37687 37727 8192 77691 77747 77948 78017 77940 77931 77847 77488 4096 123997 122607 121219 120394 120301 119908 119457 119939 2048 159816 154063 151987 150608 150449 151298 150016 148852 1024 185215 175977 169562 171078 170649 170420 169076 166614 512 232890 230669 222830 223140 222877 221812 222588 222369 rndwr 1 2 4 8 16 32 64 128 16384 38944 38256 38227 38312 38438 38432 38331 38313 8192 79773 77378 77453 77425 77473 77500 77458 77535 4096 163925 157167 158258 158192 158244 158281 158229 158252 2048 293295 322480 320206 321022 321375 321926 322298 322558 1024 368010 616516 652359 645514 654715 658132 659513 659125 512 411236 730015 1223437 1164632 1163705 1178235 1184450 1186594 Jörn -- Ninety percent of everything is crap. -- Sturgeon's Law -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
