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SubjectVM test on 2.4.13-pre3aa1 (compared to 2.4.12-aa1 and 2.4.13-pre2aa1)

Summary:

Wall clock time for this test has dropped dramatically (which
is good) over the last 3 Andrea Arcangeli patched kernels.
mp3blaster sounds less pleasant though.


Test:

Run loop of 10 iterations of Linux Test Project's "mtest01 -p80 -w"
This test attempts to allocate 80% of virtual memory and write to
each page. Simultaneously listen to mp3blaster.


Reboot before each test.

Hardware:
Athlon 1333
512 Mb RAM
1024 Mb swap


I've shown the last 2 results in a previous message. But the
side by side comparison is pretty exciting.

2.4.13pre3aa1

Averages for 10 mtest01 runs
bytes allocated: 1240045977
User time (seconds): 2.106
System time (seconds): 2.738
Elapsed (wall clock) time: 39.408
Percent of CPU this job got: 11.70
Major (requiring I/O) page faults: 110.0
Minor (reclaiming a frame) faults: 303527.4

2.4.13pre2aa1

Averages for 10 mtest01 runs
bytes allocated: 1245184000
User time (seconds): 2.050
System time (seconds): 2.874
Elapsed (wall clock) time: 49.513
Percent of CPU this job got: 9.70
Major (requiring I/O) page faults: 115.6
Minor (reclaiming a frame) faults: 304781.9

2.4.12aa1

Averages for 10 mtest01 runs
bytes allocated: 1253362892
User time (seconds): 2.099
System time (seconds): 2.823
Elapsed (wall clock) time: 64.109
Percent of CPU this job got: 7.50
Major (requiring I/O) page faults: 135.2
Minor (reclaiming a frame) faults: 306779.8


The rest of the results below are just from 2.4.13pre3aa1.

mtest01 passes each time with the expect 1.2 gigabytes of
memory allocated:

PASS ... 1215299584 bytes allocated.
PASS ... 1242562560 bytes allocated.
PASS ... 1240465408 bytes allocated.
PASS ... 1241513984 bytes allocated.
PASS ... 1244659712 bytes allocated.
PASS ... 1241513984 bytes allocated.
PASS ... 1245708288 bytes allocated.
PASS ... 1242562560 bytes allocated.
PASS ... 1243611136 bytes allocated.
PASS ... 1242562560 bytes allocated.

mp3blaster is much less pleasant as the wall clock time for VM improves.
With 2.4.13pre3aa1, mp3blaster stutters through almost the entire run.
The last 3-4 seconds of each iteration sound good though. (highest vmstat
swpd value and the next 2 low values). This "sounds good" may actually be
the first 3-4 seconds of the test.


vmstat 1 output for 1 iteration:

vmstat output starts towards the end of one iteration, goes through a complete cycle,
then the beginning of another.

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 6 1 685252 1548 1188 1136 72 23192 380 23192 419 310 3 8 89
0 6 1 707740 1648 1196 1140 44 20532 412 20552 368 335 5 9 86
0 4 0 725628 3624 1176 1152 32 20264 512 20264 343 300 2 10 88

mp3blaster sounds good

1 4 0 738192 3312 1216 1908 516 11276 1528 11276 467 435 3 4 93
2 0 0 15928 387480 1264 3148 352 0 1632 0 477 686 19 24 56
2 0 0 15756 122780 1280 3172 0 0 24 24 285 563 35 65 0

mp3blaster stutters until the end of test iteration.

3 3 0 47424 3788 1172 1412 860 40228 892 40236 789 819 12 23 66
0 5 1 90244 1656 1184 1416 1032 39568 1076 39572 653 425 6 5 89
1 3 0 129592 3744 1176 1416 236 40960 276 40988 588 432 5 8 87
0 2 1 159260 3584 1172 1540 132 27676 300 27680 396 270 7 9 84
0 5 1 187764 2572 1184 1416 312 29632 368 29636 534 448 5 7 88
0 5 1 218844 1648 1176 1416 220 31268 256 31272 560 486 5 7 89
0 2 1 242820 2548 1172 1416 124 24576 168 24600 419 376 3 8 89
1 1 1 280660 3052 1176 1416 60 36352 116 36356 554 439 3 10 87
0 3 1 325164 2036 1176 1416 40 44832 76 44836 586 467 4 10 86
0 3 1 350204 1660 1172 1420 44 25824 88 25852 432 319 3 12 85
1 2 1 396728 3564 1184 1416 72 45780 120 45784 637 528 3 12 86
0 3 1 423816 3572 1180 1416 48 27020 80 27024 420 361 2 14 84
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 3 2 467284 1644 1200 1420 52 42816 100 42832 627 482 5 10 85
0 3 1 490292 2040 1180 1420 32 23648 40 23656 344 242 6 12 82
0 3 1 512764 1660 1172 956 292 23604 340 23604 426 273 5 14 81
0 3 1 539844 2108 1184 968 56 26728 316 26728 463 338 3 11 86
0 3 1 563852 2036 1184 976 56 23500 512 23500 440 357 3 11 86
1 2 1 579656 1908 1172 1004 332 17356 1324 17380 411 352 3 8 89
1 3 1 605720 1652 1184 1024 48 24656 516 24656 456 375 0 11 89
0 6 1 627676 3176 1200 1028 64 21432 316 21436 386 283 3 9 88
1 3 0 642980 3804 1180 1048 56 16376 888 16376 356 280 4 7 89
2 3 1 661348 1776 1180 1064 312 18816 724 18860 390 340 2 9 89
0 4 1 686888 2148 1184 1256 68 23992 848 23992 443 359 3 9 88
1 4 1 705276 1896 1188 1116 44 19880 836 19880 431 331 2 6 92

mp3blaster sounds good

0 5 1 724676 1652 1192 1124 240 18388 1084 18388 371 336 2 13 85
1 4 1 16348 491352 1220 1796 512 12108 1332 12132 393 403 2 11 87
2 2 0 15872 489360 1264 3004 732 0 1984 0 472 691 2 3 95
3 0 0 15692 266700 1284 3168 116 0 296 0 344 639 41 46 14

mp3blaster begins to stutter again

2 0 0 14604 4480 1284 3196 316 0 344 0 300 587 46 54 0
0 4 0 32952 3572 1176 1464 372 21932 392 21944 393 313 9 12 79


vmstat 1 output from 2.4.12aa1 and 2.4.13pre2aa1 is in previous messages. Subject
is something like VM Test on {kernel versions}. Two separate tiny email threads.

--
Randy Hron

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