Tests: Fill and write to 80% of vitual memory 10 times.
mmap, touch, msync, and munmap 500000 pages 5 times.
Simultaneously listen to long mp3 sampled at 128k with
mp3blaster.
Summary: 2.4.15-pre6 49% faster on memfill test with higher mp3
play time. 2.4.15-pre6 11% faster on mmap test.
Config diff: CONFIG_RWSEM_XCHGADD_ALGORITHM=y in 2.4.15-pre6
Hardware:
Athlon 1333
1024 MB RAM
1024 MB swap
2.4.15-pre6 used a higher percentage of CPU time for both tests.
2.4.15-pre6 played 97% of mp3 and 2.4.15pre6aa1 played 84% during memfill test.
I include one iteration of vmstat 1 from the memfill test because of differences
in b, free, memcache, etc columns.
2.4.15-pre6
-------------
mp3 played 297 seconds of 304 second run. (97%)
Averages for 10 mtest01 runs
bytes allocated: 1652241203
User time (seconds): 7.621
System time (seconds): 6.058
Elapsed (wall clock) time: 30.314
Percent of CPU this job got: 44.60
Major (requiring I/O) page faults: 103.8
Minor (reclaiming a frame) faults: 404169.7
vmstat 1 from second iteration of mtest01 -w -p 80:
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
3 0 0 587712 2784 1164 7860 0 70656 56 70656 1278 2094 11 24 65
2 0 0 4560 863708 1204 8256 0 11136 432 11140 562 942 49 26 25
2 0 0 4560 695072 1236 8256 0 0 8 40 311 575 75 25 0
2 0 0 4560 525692 1236 8256 0 0 0 0 277 540 74 26 0
3 0 0 4560 357032 1236 8384 0 0 128 0 301 564 81 19 0
2 0 0 4560 187624 1236 8384 0 0 0 0 300 542 81 19 0
2 0 0 4560 17892 1236 8384 0 0 0 0 309 603 83 17 0
2 1 1 86896 4932 1172 7812 0 15384 40 15416 554 1779 10 77 13
9 0 2 139632 2176 1164 7808 0 92680 36 92672 1717 2363 5 15 80
1 2 1 150768 2564 1188 7820 0 27052 92 27080 612 843 35 16 49
2 1 0 184176 2240 1172 7812 0 35876 20 35884 718 1136 10 30 60
1 1 0 218864 2660 1176 7816 0 36720 28 36724 625 1113 15 36 49
1 2 0 243952 2584 1176 7812 0 35880 20 35880 612 1059 13 22 64
0 2 0 303600 2604 1176 7816 248 55772 344 55800 1097 1960 13 24 63
1 1 0 363632 2580 1168 7820 0 51452 48 51460 1049 1929 14 26 60
0 2 0 400496 2656 1176 7816 0 49192 36 49192 819 1348 11 24 65
0 2 1 450672 2552 1188 7820 0 49416 44 49444 911 1699 11 26 62
2 2 0 498416 2592 1172 7820 0 44628 40 44632 901 1658 13 24 64
1 2 0 535408 2644 1176 7816 0 40996 32 41000 706 1295 14 20 66
0 2 0 584432 2548 1172 7816 0 49024 40 49028 901 1664 13 26 62
1 2 0 643568 2608 1172 7816 0 59132 316 59160 1158 1951 14 24 63
2 0 0 18580 880156 1208 7992 272 220 496 224 537 938 51 26 22
mp3 played 807 seconds of 808 second run.
Average for 5 mmap001 runs
bytes allocated: 2048000000
User time (seconds): 4.184
System time (seconds): 25.596
Elapsed (wall clock seconds) time: 161.70
Percent of CPU this job got: 18.00
Major (requiring I/O) page faults: 500153.2
Minor (reclaiming a frame) faults: 35.6
2.4.15pre6aa1
-------------
mp3 played 370 seconds of 454 second run. (84%)
Averages for 10 mtest01 runs
bytes allocated: 1666501836
User time (seconds): 7.602
System time (seconds): 3.114
Elapsed (wall clock) time: 45.371
Percent of CPU this job got: 23.20
Major (requiring I/O) page faults: 145.0
Minor (reclaiming a frame) faults: 407645.8
vmstat 1 from second iteration of mtest01 -w -p 80:
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 1 580208 28232 1180 1272 84 23680 192 23684 466 709 8 13 79
2 1 0 9524 1009964 1248 2204 332 384 1316 428 459 617 11 15 74
2 0 0 9520 855112 1268 2476 28 0 316 0 303 569 78 19 3
3 0 0 9520 685728 1268 2476 0 0 0 0 275 543 76 24 0
2 0 0 9520 516008 1268 2476 0 0 0 0 275 544 81 19 0
2 0 0 9520 346556 1268 2476 0 0 0 0 275 540 75 25 0
3 0 0 9520 176932 1284 2476 0 0 0 24 292 547 85 15 0
1 1 1 12588 27572 1176 1392 236 5084 388 5092 549 818 53 22 25
1 9 1 27532 27876 1200 488 380 14684 692 14688 563 562 6 17 77
1 6 1 47108 26108 1176 600 428 19696 896 19700 657 666 6 15 79
0 5 0 80120 28000 1188 628 688 32992 1132 33028 971 896 7 16 77
1 4 1 92892 26452 1164 728 576 12800 1144 12804 573 626 6 14 80
0 5 1 120796 25832 1164 744 496 28032 804 28036 795 714 6 16 77
1 5 1 146776 26608 1164 792 408 25984 680 26012 764 704 6 12 81
2 3 1 189528 27004 1180 796 408 42496 688 42500 1097 1292 8 9 83
1 2 1 210132 26724 1184 800 192 20864 276 20868 446 609 10 12 78
0 3 1 239188 26760 1168 836 28 28800 224 28828 700 1299 14 6 80
1 4 1 264012 27108 1172 840 76 24704 216 24712 586 1084 10 10 81
1 3 0 284224 28652 1176 836 36 20480 252 20484 524 992 7 7 86
1 2 1 306748 28208 1184 844 24 22656 164 22660 522 993 11 6 82
3 0 2 326972 26608 1192 880 0 20224 176 20252 492 866 12 10 78
0 3 1 351036 26608 1180 864 0 23936 132 23956 550 850 9 8 82
2 2 1 375612 27792 1176 876 0 24704 196 24708 514 776 5 12 83
2 1 1 400316 27972 1184 892 4 24596 200 24600 571 777 10 4 86
0 3 2 429116 26612 1188 900 4 28780 148 28800 546 878 10 8 81
2 2 1 464316 28404 1164 912 8 35072 252 35084 678 1085 10 11 80
1 3 1 491320 27356 1184 976 68 27136 556 27140 611 864 9 8 83
0 4 0 515384 28860 1184 952 40 24064 180 24068 550 812 8 6 85
0 4 0 550020 28860 1176 956 144 34816 268 34844 670 1164 12 6 82
2 2 0 578676 27648 1172 984 24 28544 196 28548 568 985 10 12 79
1 3 1 603868 27948 1180 976 24 25216 168 25220 534 835 8 13 79
0 4 1 631624 26608 1172 1004 20 27648 188 27652 504 825 12 8 80
2 3 1 662184 26904 1172 996 56 30592 224 30624 658 1076 9 7 84
0 4 0 9712 1011020 1236 1460 308 7680 876 7684 516 775 6 11 83
mp3 played 901 seconds of 902 second run.
Average for 5 mmap001 runs
bytes allocated: 2048000000
User time (seconds): 3.560
System time (seconds): 23.622
Elapsed (wall clock seconds) time: 180.49
Percent of CPU this job got: 14.60
Major (requiring I/O) page faults: 500191.6
Minor (reclaiming a frame) faults: 30.4
Hope this information is useful!
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