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Message-ID: <20070102235733.GG18033@redhat.com> Date: Tue, 2 Jan 2007 18:57:33 -0500 From: Dave Jones <davej@...hat.com> To: mingo@...hat.com Cc: Linux Kernel <linux-kernel@...r.kernel.org> Subject: inaccurate migration cost calculation? Across different boots using the same 2.6.19 kernel on a quad-core xeon I see huge variance in the migration_cost being reported during boot. -migration_cost=39,3940 +migration_cost=25,4941 This CPU has a very large cache which could be key here... L1 Instruction cache: 32KB, 8-way associative. 64 byte line size. L1 Data cache: 32KB, 8-way associative. 64 byte line size. L3 unified cache: 4MB, 16-way associative. 64 byte line size. Here's the output of migration_debug=1 for another two boots.. -> [0][1][ 65536] 0.0 [ 0.0] (1): ( 42507 21253) -> [0][1][ 72817] 0.0 [ 0.0] (1): ( 46350 12548) -> [0][1][ 80907] 0.0 [ 0.0] (1): ( 58571 12384) -> [0][1][ 89896] 0.0 [ 0.0] (1): ( 57738 6608) -> [0][1][ 99884] 0.0 [ 0.0] (1): ( 60743 4806) -> [0][1][ 110982] 0.0 [ 0.0] (1): ( 67393 5728) -> [0][1][ 123313] 0.0 [ 0.0] (1): ( 72416 5375) -> [0][1][ 137014] 0.0 [ 0.0] (1): ( 73890 3424) -> [0][1][ 152237] 0.0 [ 0.0] (1): ( 75735 2634) -> [0][1][ 169152] 0.0 [ 0.0] (1): ( 91870 9384) -> [0][1][ 187946] 0.0 [ 0.0] (1): ( 88701 6276) -> [0][1][ 208828] 0.1 [ 0.1] (1): ( 102106 9840) -> [0][1][ 232031] 0.1 [ 0.1] (1): ( 112433 10083) -> [0][1][ 257812] 0.1 [ 0.1] (1): ( 118441 8045) -> [0][1][ 286457] 0.1 [ 0.1] (1): ( 126302 7953) -> [0][1][ 318285] 0.1 [ 0.1] (1): ( 135442 8546) -> [0][1][ 353650] 0.1 [ 0.1] (1): ( 165438 19271) -> [0][1][ 392944] 0.1 [ 0.1] (1): ( 196143 24988) -> [0][1][ 436604] 0.1 [ 0.1] (1): ( 180626 20252) -> [0][1][ 485115] 0.2 [ 0.2] (1): ( 209017 24321) -> [0][1][ 539016] 0.2 [ 0.2] (1): ( 231664 23484) -> [0][1][ 598906] 0.2 [ 0.2] (1): ( 277569 34694) -> [0][1][ 665451] 0.2 [ 0.2] (1): ( 276351 17956) -> [0][1][ 739390] 0.3 [ 0.3] (1): ( 318707 30156) -> [0][1][ 821544] 0.3 [ 0.3] (1): ( 382865 47157) -> [0][1][ 912826] 0.3 [ 0.3] (1): ( 398566 31429) -> [0][1][1014251] 0.4 [ 0.4] (1): ( 441757 37310) -> [0][1][1126945] 0.5 [ 0.5] (1): ( 516100 55826) -> [0][1][1252161] 0.5 [ 0.5] (1): ( 543549 41637) -> [0][1][1391290] 0.6 [ 0.6] (1): ( 603068 50578) -> [0][1][1545877] 0.6 [ 0.6] (1): ( 637083 42296) -> [0][1][1717641] 0.8 [ 0.8] (1): ( 800596 102904) -> [0][1][1908490] 0.8 [ 0.8] (1): ( 856786 79547) -> [0][1][2120544] 0.9 [ 0.9] (1): ( 919895 71328) -> [0][1][2356160] 0.9 [ 0.9] (1): ( 973085 62259) -> [0][1][2617955] 1.1 [ 1.1] (1): ( 1114043 101608) -> [0][1][2908838] 1.2 [ 1.2] (1): ( 1219850 103707) -> [0][1][3232042] 1.3 [ 1.3] (1): ( 1327969 105913) -> [0][1][3591157] 1.4 [ 1.4] (1): ( 1463296 120620) -> [0][1][3990174] 1.6 [ 1.6] (1): ( 1630438 143881) -> [0][1][4433526] 1.7 [ 1.7] (1): ( 1729272 121357) -> [0][1][4926140] 1.7 [ 1.7] (1): ( 1733278 62681) -> [0][1][5473488] 1.9 [ 1.9] (1): ( 1958482 143942) -> [0][1][6081653] 1.8 [ 1.9] (1): ( 1872926 114749) -> [0][1][6757392] 1.7 [ 1.9] (1): ( 1713013 137331) -> [0][1][7508213] 1.3 [ 1.9] (1): ( 1392757 228793) -> [0][1][8342458] 1.1 [ 1.9] (1): ( 1116378 252586) -> found max. [0][1] working set size found: 5473488, cost: 1958482 -> [0][2][ 65536] 0.0 [ 0.0] (0): ( 9187 4593) -> [0][2][ 72817] 0.0 [ 0.0] (0): ( 13719 4562) -> [0][2][ 80907] 0.0 [ 0.0] (0): ( 8008 5136) -> [0][2][ 89896] 0.0 [ 0.0] (0): ( 7924 2610) -> [0][2][ 99884] 0.0 [ 0.0] (0): ( 2640 3947) -> found max. [0][2] working set size found: 72817, cost: 13719 migration: max_cache_size: 0, cpu: 2666 MHz: migration_cost=27,3916 migration: 0 seconds -> [0][1][ 65536] 0.0 [ 0.0] (1): ( 36355 18177) -> [0][1][ 72817] 0.0 [ 0.0] (1): ( 49107 15464) -> [0][1][ 80907] 0.0 [ 0.0] (1): ( 57124 11740) -> [0][1][ 89896] 0.0 [ 0.0] (1): ( 57766 6191) -> [0][1][ 99884] 0.0 [ 0.0] (1): ( 72324 10374) -> [0][1][ 110982] 0.0 [ 0.0] (1): ( 80125 9087) -> [0][1][ 123313] 0.0 [ 0.0] (1): ( 74042 7585) -> [0][1][ 137014] 0.0 [ 0.0] (1): ( 78227 5885) -> [0][1][ 152237] 0.0 [ 0.0] (1): ( 80157 3907) -> [0][1][ 169152] 0.0 [ 0.0] (1): ( 88881 6315) -> [0][1][ 187946] 0.0 [ 0.0] (1): ( 99344 8389) -> [0][1][ 208828] 0.1 [ 0.1] (1): ( 104998 7021) -> [0][1][ 232031] 0.1 [ 0.1] (1): ( 113660 7841) -> [0][1][ 257812] 0.1 [ 0.1] (1): ( 124690 9435) -> [0][1][ 286457] 0.1 [ 0.1] (1): ( 135835 10290) -> [0][1][ 318285] 0.1 [ 0.1] (1): ( 153135 13795) -> [0][1][ 353650] 0.1 [ 0.1] (1): ( 145024 10953) -> [0][1][ 392944] 0.2 [ 0.2] (1): ( 215998 40963) -> [0][1][ 436604] 0.2 [ 0.2] (1): ( 212086 22437) -> [0][1][ 485115] 0.2 [ 0.2] (1): ( 250632 30491) -> [0][1][ 539016] 0.2 [ 0.2] (1): ( 221014 30054) -> [0][1][ 598906] 0.2 [ 0.2] (1): ( 281687 45363) -> [0][1][ 665451] 0.2 [ 0.2] (1): ( 296981 30328) -> [0][1][ 739390] 0.3 [ 0.3] (1): ( 351999 42673) -> [0][1][ 821544] 0.4 [ 0.4] (1): ( 413272 51973) -> [0][1][ 912826] 0.4 [ 0.4] (1): ( 402094 31575) -> [0][1][1014251] 0.4 [ 0.4] (1): ( 461726 45603) -> [0][1][1126945] 0.5 [ 0.5] (1): ( 504549 44213) -> [0][1][1252161] 0.5 [ 0.5] (1): ( 570889 55276) -> [0][1][1391290] 0.6 [ 0.6] (1): ( 637668 61027) -> [0][1][1545877] 0.6 [ 0.6] (1): ( 660241 41800) -> [0][1][1717641] 0.8 [ 0.8] (1): ( 820951 101255) -> [0][1][1908490] 0.8 [ 0.8] (1): ( 860249 70276) -> [0][1][2120544] 0.9 [ 0.9] (1): ( 947017 78522) -> [0][1][2356160] 0.9 [ 0.9] (1): ( 999742 65623) -> [0][1][2617955] 1.1 [ 1.1] (1): ( 1152233 109057) -> [0][1][2908838] 1.2 [ 1.2] (1): ( 1247362 102093) -> [0][1][3232042] 1.3 [ 1.3] (1): ( 1371438 113084) -> [0][1][3591157] 1.5 [ 1.5] (1): ( 1518791 130218) -> [0][1][3990174] 1.6 [ 1.6] (1): ( 1621385 116406) -> [0][1][4433526] 1.7 [ 1.7] (1): ( 1775523 135272) -> [0][1][4926140] 1.7 [ 1.7] (1): ( 1784080 71914) -> [0][1][5473488] 1.9 [ 1.9] (1): ( 1970125 128979) -> [0][1][6081653] 1.9 [ 1.9] (1): ( 1926772 86166) -> [0][1][6757392] 1.7 [ 1.9] (1): ( 1722660 145139) -> [0][1][7508213] 1.4 [ 1.9] (1): ( 1405442 231178) -> [0][1][8342458] 1.1 [ 1.9] (1): ( 1107804 264408) -> found max. [0][1] working set size found: 5473488, cost: 1970125 -> [0][2][ 65536] 0.0 [ 0.0] (0): ( 8829 4414) -> [0][2][ 72817] 0.0 [ 0.0] (0): ( 8027 2608) -> [0][2][ 80907] 0.0 [ 0.0] (0): ( 7606 1514) -> [0][2][ 89896] 0.0 [ 0.0] (0): ( 8161 1034) -> [0][2][ 99884] 0.0 [ 0.0] (0): ( 7894 650) -> [0][2][ 110982] 0.0 [ 0.0] (0): ( 8264 510) -> [0][2][ 123313] 0.0 [ 0.0] (0): ( 7581 596) -> [0][2][ 137014] 0.0 [ 0.0] (0): ( 7079 549) -> [0][2][ 152237] 0.0 [ 0.0] (0): ( 7230 350) -> [0][2][ 169152] 0.0 [ 0.0] (0): ( 7699 409) -> [0][2][ 187946] 0.0 [ 0.0] (0): ( 5896 1106) -> [0][2][ 208828] 0.0 [ 0.0] (0): ( 9608 2409) -> [0][2][ 232031] 0.0 [ 0.0] (0): ( 12809 2805) -> [0][2][ 257812] 0.0 [ 0.0] (0): ( 7996 3809) -> [0][2][ 286457] 0.0 [ 0.0] (0): ( 18848 7330) -> [0][2][ 318285] 0.0 [ 0.0] (0): ( 7747 9215) -> [0][2][ 353650] 0.0 [ 0.0] (0): ( 11258 6363) -> [0][2][ 392944] 0.0 [ 0.0] (0): ( 18775 6940) -> [0][2][ 436604] 0.0 [ 0.0] (0): ( 12380 6667) -> [0][2][ 485115] 0.0 [ 0.0] (0): ( 19986 7136) -> [0][2][ 539016] 0.0 [ 0.0] (0): ( -6102 16612) -> [0][2][ 598906] 0.0 [ 0.0] (0): ( 3783 13248) -> [0][2][ 665451] 0.0 [ 0.0] (0): ( -3546 10288) -> found max. [0][2] working set size found: 485115, cost: 19986 migration: max_cache_size: 0, cpu: 2666 MHz: migration_cost=39,3940 migration: 0 seconds Dave -- http://www.codemonkey.org.uk - 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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