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SubjectRe: Linux 2.4.1-ac7
On Thu, Feb 08, 2001 at 08:12:39PM -0200, Rik van Riel wrote:
> On Thu, 8 Feb 2001, Alan Cox wrote:
>
> > ftp://ftp.kernel.org/pub/linux/kernel/people/alan/2.4/
> >
> > 2.4.1-ac7
> > o Rebalance the 2.4.1 VM (Rik van Riel)
> > | This should make things feel a lot faster especially
> > | on small boxes .. feedback to Rik
>
> I'd really like feedback from people when it comes to this
> change. The change /should/ fix most paging performance bugs
> because it makes kswapd do the right amount of work in order
> to solve the free memory shortage every time it is run.

I just tested ac8.

If I run this test, the system gets really slow. It takes about
a second between the time I press a key, and the time it appears
on the screen. The load goes way up. Everything seems to block.

This is a box with 64 MB or RAM, and 32 MB of swap. There isn't
much running on the box while doing this, only dnetc.

It starts to get slow from the time the process starts is about
70 MB. Then you really hear the disk work. It ended up at about
75 MB, where it got killed by the OOM killer. (For once it killed
the right thing!)

I ran a vmstat 1, while doing this, and have attached the output.

It ran for serval minutes. The process itself took about 1
minutes of CPU time, and so did kswapd. It took atleast 5
minutes real time.

I once did just the same with 2.4.0, it took more like 30 minutes
then, and I ended up killing the process myself.


Kurt

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 16580 1808 1200 43336 0 0 83 4 130 25 93 2 5
1 0 0 16704 1804 1200 43460 0 0 0 0 116 4 100 0 0
1 0 0 16704 1804 1200 43460 0 0 0 0 120 4 100 0 0
1 0 0 16784 1808 1200 43540 0 0 0 0 102 6 99 1 0
1 0 0 16904 1808 1200 43660 0 0 0 0 101 7 99 1 0
1 0 0 16988 1808 1200 43744 0 0 0 0 130 32 99 1 0
1 0 0 16988 1808 1200 43744 0 0 0 0 136 18 100 0 0
1 0 0 17152 1808 1200 43908 0 0 0 0 110 14 100 0 0
1 0 0 17152 1808 1200 43908 0 0 0 3 110 10 100 0 0
2 0 0 17112 1428 1204 43960 0 0 384 4 142 63 98 2 0
2 0 0 17268 1428 1204 43016 0 0 130 0 133 46 100 0 0
2 0 0 17344 1428 1204 41980 0 0 128 0 110 47 97 3 0
2 0 0 17548 1428 1204 41104 0 0 129 0 116 48 98 2 0
2 0 0 17604 1428 1204 40056 0 0 128 0 102 45 97 3 0
2 0 0 17820 1428 1208 39188 0 0 129 0 106 49 97 3 0
2 0 0 17972 1428 1208 38288 0 0 128 0 108 48 99 1 0
2 0 0 18136 1428 1208 37352 0 0 129 0 104 46 95 5 0
2 0 0 18140 1428 1208 36296 0 0 128 0 107 49 98 2 0
2 0 0 18140 1428 1208 35212 0 0 129 0 108 54 96 4 0
2 0 0 18140 1428 1208 34108 0 0 128 0 105 44 99 1 0
2 0 0 18140 1428 1208 33208 0 0 0 0 126 47 96 4 0
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
2 0 0 18116 1456 1168 32144 0 0 129 0 127 49 96 4 0
2 0 0 18116 1368 1100 31236 0 0 128 0 110 46 97 3 0
2 0 0 18752 1304 1016 30944 0 0 129 1 107 51 97 3 0
2 0 0 18752 2020 908 29944 0 0 128 0 109 49 100 0 0
2 0 0 18752 1296 904 29596 0 0 129 0 104 45 95 5 0
2 0 0 18752 1300 880 28788 0 248 128 62 106 42 97 3 0
2 1 0 18752 1236 880 27864 0 1896 73 531 162 52 95 5 0
2 0 0 18752 948 880 27056 0 0 184 0 128 43 96 4 0
2 0 0 18752 948 856 26008 0 0 0 0 105 41 98 2 0
2 0 0 19688 980 840 26024 0 1360 129 340 133 50 97 3 0
2 0 0 19688 948 828 25028 0 624 128 156 114 46 98 2 0
2 0 0 20628 948 812 25008 0 192 129 48 108 45 95 5 0
2 0 0 23420 948 784 26956 0 1140 128 285 125 49 97 3 0
2 0 0 23464 948 676 26604 0 0 130 0 105 49 99 1 0
2 0 0 23560 948 564 25780 0 820 128 214 132 43 95 5 0
2 1 0 23840 948 560 25036 0 244 73 61 109 47 96 4 0
2 0 0 23940 948 556 24184 0 1768 56 445 152 61 94 6 0
2 0 0 23928 948 540 23144 0 0 143 0 111 55 98 2 0
2 0 0 24168 948 532 22352 0 164 129 41 106 48 96 4 0
2 0 0 29044 948 504 26240 0 120 128 30 105 42 97 3 0
2 0 0 31476 948 412 28256 0 316 129 79 126 48 96 4 0
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 31476 948 416 27300 0 1580 193 413 269 68 97 3 0
2 0 0 32580 948 416 27404 0 0 41 0 214 183 98 2 0
2 0 0 33256 952 344 27208 0 2624 129 661 224 62 95 5 0
2 0 0 33256 948 344 26176 0 0 128 0 107 46 99 1 0
2 1 0 33256 948 320 25064 216 360 183 90 156 62 98 2 0
2 0 0 33256 952 320 24012 0 1348 128 343 217 68 92 8 0
2 1 0 33256 952 324 22760 156 4192 168 1052 232 80 97 3 0
2 0 0 33244 1104 324 21676 60 0 143 1 113 54 98 2 0
2 0 0 33244 948 324 20792 0 0 129 0 112 45 99 1 0
2 0 0 33256 948 324 19744 0 0 128 0 108 47 98 2 0
2 0 0 33256 948 264 18792 0 956 129 258 142 51 95 5 0
1 3 0 33256 948 216 16628 1380 3540 936 892 640 443 97 3 0
2 0 0 33256 948 204 16012 908 596 292 150 312 124 97 3 0
2 2 0 33256 948 212 15252 812 3084 585 778 783 230 97 3 0
2 0 0 33256 948 196 14180 888 148 222 37 229 79 92 8 0
2 0 0 33256 948 176 13384 196 84 177 27 166 69 95 5 0
2 0 0 33244 952 140 12780 324 444 81 111 231 47 96 4 0
1 1 0 33240 948 120 12168 820 120 593 30 260 97 91 9 0
1 1 0 33252 948 112 12272 656 596 317 149 338 88 94 6 0
1 1 0 33156 948 108 11588 1616 24 444 6 273 114 88 12 0
1 2 0 33008 948 104 11504 1104 908 742 231 511 139 97 3 0
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 3 0 33256 948 108 11684 96 840 200 215 372 64 69 3 29
2 1 0 33252 948 112 11536 1240 76 646 19 271 128 62 11 27
2 1 0 33192 948 116 11328 1140 424 661 115 350 163 95 5 0
3 0 0 33220 948 108 10940 1040 104 486 26 249 104 95 5 0
2 2 1 33212 948 104 10304 1192 888 1055 222 483 167 92 8 0
0 5 2 33256 960 128 10144 776 984 1034 249 532 309 15 5 80
1 3 2 33092 948 172 9256 25272 5204 13656 1353 5175 3290 75 7 18
1 5 0 33160 948 188 8988 9124 1848 5505 481 2059 1207 73 8 19
1 4 0 33256 948 92 9244 27840 1348 12610 366 3909 2472 63 10 27
0 4 0 33244 952 100 9184 3680 1208 2197 309 880 548 38 6 56
1 2 0 33228 948 100 9032 4000 0 2305 0 530 288 87 13 0
2 0 0 33244 948 92 8668 5596 0 1710 0 519 308 82 18 0
2 1 0 33240 948 84 8196 21760 780 9027 206 2871 2039 74 16 9
1 2 0 33256 956 100 8036 8924 768 4927 195 1508 881 48 13 39
1 4 0 33204 948 120 7080 72404 4228 36881 1125 10094 7076 73 16 12
1 1 2 33256 980 120 7248 668 1148 359 304 556 182 55 8 37
0 1 2 33256 948 96 7272 5924 0 2162 0 444 355 21 79 0
3 0 0 33252 948 120 7140 9884 0 4819 0 971 749 69 26 5
0 1 2 33256 948 112 7016 5444 0 1933 0 434 335 25 75 0
1 1 1 33256 952 112 6928 6428 0 2756 0 576 430 16 84 0
0 2 2 33224 952 120 6552 23472 1168 9974 319 2949 2222 56 28 16
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 1 1 33236 948 80 6460 5148 0 1783 0 451 441 75 25 0
0 2 1 33252 948 84 6300 8000 636 2663 164 833 596 61 19 20
0 1 2 33256 948 84 6220 7644 0 2763 0 546 457 41 59 0
1 1 1 33256 948 92 6124 7268 0 2660 0 576 447 19 81 0
1 1 1 33256 948 80 6024 4584 0 1310 0 330 226 27 73 0
1 3 1 33252 952 80 5424 109560 6484 60432 1726 13842 10005 50 31 19
1 2 1 33256 948 84 5296 4120 124 1710 33 385 305 54 46 0
0 1 1 33244 948 84 5076 5612 188 2583 52 614 418 59 33 8
1 2 0 33256 948 76 4812 5952 120 1922 35 486 363 73 25 1
1 3 1 33256 948 80 4464 95892 4760 65812 1311 13520 8549 44 32 24
0 5 1 33256 948 84 4328 16700 860 9344 223 2114 1367 43 40 17
1 4 0 11040 46048 240 9420 26120 1968 15365 516 4394 3664 59 23 18
2 0 0 11040 45092 336 10020 260 0 482 6 351 315 95 5 0
2 0 1 11040 44880 340 10168 148 0 41 0 308 43 99 1 0
1 0 0 11040 44880 340 10168 0 0 0 0 110 6 100 0 0
1 0 0 11040 44880 340 10168 0 0 0 0 100 4 99 1 0
1 0 0 11040 44824 344 10200 12 0 22 0 110 24 98 2 0
1 0 0 11040 44660 344 10344 0 0 139 0 120 24 88 0 12
1 0 0 11040 44672 344 10340 0 0 0 0 102 8 100 0 0
1 0 0 11040 44672 344 10340 0 0 0 0 105 6 99 1 0
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