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Date: 11 Jun 2014 23:43:58 -0400 From: "George Spelvin" <linux@...izon.com> To: linux@...izon.com, tytso@....edu Cc: hpa@...ux.intel.com, linux-kernel@...r.kernel.org, mingo@...nel.org, price@....edu Subject: Re: drivers/char/random.c: More futzing about Just to add to my total confusion about the totally disparate performance numbers we're seeing, I did some benchmarks on other machines. The speedup isn't as good one-pass as it is iterated, and as I mentioned it's slower on a P4, but it's not 7 times slower by any stretch. There are all 1-iteration numbers, run immediately after scp-ing the binary to the machine so there's no possibility if anything being cached. (The "64" and "32" versions are compiled -m32 and -m64, of course.) 2.5 GHz Phenom 9850: $ /tmp/random64 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 199 142 (-57) 1: 104 95 (-9) 2: 104 110 (+6) 3: 103 109 (+6) 4: 105 89 (-16) 5: 103 88 (-15) 6: 104 89 (-15) 7: 104 95 (-9) 8: 105 85 (-20) 9: 105 85 (-20) $ /tmp/random32 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 324 147 (-177) 1: 100 86 (-14) 2: 100 99 (-1) 3: 100 88 (-12) 4: 100 86 (-14) 5: 100 86 (-14) 6: 100 89 (-11) 7: 100 111 (+11) 8: 100 111 (+11) 9: 100 88 (-12) $ /tmp/random64 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 554788 220327 (-334461) 1: 554825 220176 (-334649) 2: 553505 220148 (-333357) 3: 554661 220064 (-334597) 4: 569559 220064 (-349495) 5: 612798 220065 (-392733) 6: 570287 220064 (-350223) 7: 554790 220064 (-334726) 8: 554715 220065 (-334650) 9: 569840 220064 (-349776) $ /tmp/random32 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 520117 280225 (-239892) 1: 520125 280154 (-239971) 2: 520104 280094 (-240010) 3: 520079 280060 (-240019) 4: 520069 280060 (-240009) 5: 520060 280060 (-240000) 6: 558971 280060 (-278911) 7: 520102 280060 (-240042) 8: 520082 280060 (-240022) 9: 520058 280060 (-239998) 3 GHz i5-3330: $ /tmp/random64 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 78 75 (-3) 1: 36 33 (-3) 2: 33 39 (+6) 3: 36 30 (-6) 4: 36 33 (-3) 5: 30 33 (+3) 6: 30 54 (+24) 7: 24 48 (+24) 8: 27 33 (+6) 9: 30 33 (+3) $ /tmp/random32 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 66 78 (+12) 1: 39 39 (+0) 2: 36 39 (+3) 3: 45 33 (-12) 4: 42 33 (-9) 5: 33 42 (+9) 6: 45 33 (-12) 7: 39 36 (-3) 8: 105 48 (-57) 9: 42 39 (-3) $ /tmp/random64 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 406188 218104 (-188084) 1: 402620 246968 (-155652) 2: 402652 239840 (-162812) 3: 402720 200312 (-202408) 4: 402584 200080 (-202504) 5: 447488 200228 (-247260) 6: 402788 200312 (-202476) 7: 402688 200080 (-202608) 8: 427140 224320 (-202820) 9: 402576 200080 (-202496) $ /tmp/random32 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 406485 266670 (-139815) 1: 392694 266463 (-126231) 2: 392496 266763 (-125733) 3: 426003 266145 (-159858) 4: 392688 266667 (-126021) 5: 432231 266589 (-165642) 6: 392754 298734 (-94020) 7: 392883 284994 (-107889) 8: 392637 266694 (-125943) 9: 392985 267024 (-125961) 3.5 GHz i7-2700: # /tmp/perftest /tmp/random64 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 82 90 (+8) 1: 38 41 (+3) 2: 46 38 (-8) 3: 35 41 (+6) 4: 46 41 (-5) 5: 38 38 (+0) 6: 41 55 (+14) 7: 41 35 (-6) 8: 46 24 (-22) 9: 35 38 (+3) # /tmp/perftest /tmp/random32 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 82 76 (-6) 1: 32 53 (+21) 2: 49 44 (-5) 3: 35 41 (+6) 4: 46 35 (-11) 5: 35 44 (+9) 6: 49 50 (+1) 7: 41 41 (+0) 8: 32 44 (+12) 9: 49 44 (-5) # /tmp/perftest /tmp/random64 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 445486 227993 (-217493) 1: 445089 227602 (-217487) 2: 445381 227736 (-217645) 3: 445220 227661 (-217559) 4: 445159 227798 (-217361) 5: 445285 227608 (-217677) 6: 445005 227806 (-217199) 7: 445439 227608 (-217831) 8: 445328 227798 (-217530) 9: 445533 227625 (-217908) # /tmp/perftest /tmp/random32 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 437001 335959 (-101042) 1: 437004 336120 (-100884) 2: 436683 335936 (-100747) 3: 436806 336452 (-100354) 4: 436996 335988 (-101008) 5: 436916 336210 (-100706) 6: 437042 354722 (-82320) 7: 436896 336146 (-100750) 8: 436981 336741 (-100240) 9: 437016 331920 (-105096) And on a 1.6 GHz P4: $ /tmp/random32 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 312 176 (-136) 1: 112 112 (+0) 2: 112 112 (+0) 3: 112 112 (+0) 4: 112 112 (+0) 5: 112 112 (+0) 6: 112 112 (+0) 7: 112 112 (+0) 8: 112 112 (+0) 9: 112 112 (+0) $ /tmp/random32 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 480344 550192 (+69848) 1: 480088 550084 (+69996) 2: 480140 550128 (+69988) 3: 480088 550084 (+69996) 4: 480088 550084 (+69996) 5: 480088 550084 (+69996) 6: 480088 550084 (+69996) 7: 480088 550084 (+69996) 8: 480088 550084 (+69996) 9: 480088 550084 (+69996) And just for lulz, a 1.533 GHz Athlon XP: $ /tmp/random32 pool 1 = 85670974 e96b1f8f 51244abf 5863283f pool 2 = 03564c6c eba81d03 55c77fa1 760374a7 0: 91 83 (-8) 1: 58 57 (-1) 2: 58 57 (-1) 3: 58 57 (-1) 4: 58 45 (-13) 5: 58 45 (-13) 6: 58 45 (-13) 7: 58 45 (-13) 8: 58 45 (-13) 9: 58 45 (-13) $ /tmp/random32 10000 pool 1 = 54b3ba06 4769d67a eb04bbf3 5e42df6e pool 2 = 9d3c469e 6fecdb60 423af4ca 465173d1 0: 570094 380159 (-189935) 1: 550045 380088 (-169957) 2: 550028 380043 (-169985) 3: 568533 380087 (-188446) 4: 550028 380021 (-170007) 5: 550028 380021 (-170007) 6: 550028 380021 (-170007) 7: 550028 380021 (-170007) 8: 550028 382985 (-167043) 9: 550088 380021 (-170067) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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