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SubjectRe: HIGMEM, SMP, 2.4.13 and Cerberus
Date
As you suggested, I ran the test again with Linux-2.4.12-ac6, 
Linux-2.4.13-ac4 and Linux-2.4.13, this time with ext2 filesystem (the
previous cerberus run was run on ext3 partitions).

We've been unable to reproduce the system freeze with these kernels. Even
2.4.13 has remained stable, so we're again running ceberus on 2.4.13 and
ext3 partitions. If the machine stops again perhaps this is an ext3 related
problem or a bad interaction between the SCSI driver and ext3.

With respect to the differents VM in Linus and Alan trees, vmstat shows very
different numbers with respect to I/O block processes, bi and bo, and the
"jittering" of the VM. In Linus tree blocked processes and bi numbers
remains stable, while in Alan tree this values change a lot more.

Another point is that while Linus tree almost never touches swap, Alan tree
uses it right from the beginning.


The computer:

- Dell PowerEdge 2550
- Dual PIII 1Ghz
- 2Gb ECC SDRAM
- 2 x 36Gb RAID1 (AACRAID scsi driver)


Gnu C 2.95.3
Gnu make 3.79.1
binutils 2.10.91.0.4
util-linux 2.11f
mount 2.11f
modutils 2.4.5
e2fsprogs 1.24
Linux C Library 2.2.2
Dynamic linker (ldd) 2.2.2
Procps 2.0.7
Net-tools 1.60
Kbd 1.04
Sh-utils 2.0
Modules Loaded

Note: the patch linux-2.4.11-aacraid-20011010.patch is due to Dell.

Test finished after 16 without problems.
Kernel 2.4.12-ac6 - ext2 filesystem - linux-2.4.11-aacraid-20011010.patch

r b w swpd free buff cache si so bi bo in cs us sy
id
9 8 0 1638596 6004 579248 1428 2734 1978 9062 1978 404 1183 2
57 41
0 17 0 1638596 5144 584460 1428 1884 50 6704 50 343 1109 1
19
80
0 17 0 1638596 9240 578388 1424 2376 134 10056 134 372 1283 2
58
40
0 17 0 1638596 7612 576880 1424 2364 234 10136 234 368 1389 4
55
40
9 8 0 1638596 5772 580020 1424 468 274 14680 282 437 1481 16 73
11
15 2 1 1644948 5196 581244 1428 90 294 10956 300 343 1143 24 59
17
5 13 1 1638596 5700 580208 1704 608 2 11136 24 347 1084 13 68
19
0 17 0 1638596 5936 587324 2556 1326 90 9646 90 394 1427 7
36
57
17 0 1 1647216 6956 586108 2556 158 0 10674 36 333 1084 20 64
16
17 0 0 1638596 8820 584924 2552 0 0 11112 0 313 920 22 70
8
15 2 1 1638596 8876 589364 2456 0 1926 12164 1926 422 1064 23
68
9
15 2 1 1643092 8984 589692 2352 24 162 15212 190 418 1112 15 84
1
7 10 1 1641488 9476 587324 2312 1040 10 10718 14 361 1196 6
70
24
0 17 0 1638576 8344 586016 2312 1868 10554 7524 10576 558 1141 2
45 53
0 17 0 1638576 7220 586240 2312 448 282 1148 282 324 165 0 6
94
0 17 0 1638576 5108 596840 2300 1942 0 7242 0 504 1282 2
16
82
1 16 2 1638860 9732 593184 2256 2704 4566 8488 4566 446 16623 1
55 43
15 2 1 1653268 8856 597204 2276 1650 0 5704 0 355 821 2
32
66
0 17 0 1642440 9184 594052 2276 1902 1664 8876 1664 373 1396 1
45 54
2 17 0 1638592 8876 594888 2280 1936 0 8222 0 410 1112 3
39
57
0 17 1 1639596 9020 593788 2284 842 2060 6720 2074 409 1238 1
54
45

Test finished after 8 hours without problems.
Kernel 2.4.13-ac4 - ext2 filesystem - linux-2.4.11-aacraid-20011010.patch

r b w swpd free buff cache si so bi bo in cs us sy
id
0 17 0 1638596 5100 506888 4294462068 1242 0 7478 0 371 1273
5
45 50
3 14 0 1638596 9720 504188 4294464772 2292 60 9854 64 406 1371
3
54 43
0 17 0 1641360 5160 506708 4294462240 1718 680 9514 702 489 1564
4
52 44
0 17 1 1639240 9700 501588 4294467332 2286 4 7850 4 358 1244
1
44 55
0 17 0 1638708 7376 500976 4294467944 2704 0 8760 0 363 1136
2
49 50
7 10 0 1638596 8744 498656 4294470208 2026 322 9302 322 419 1557
1
47 52
17 0 1 1644004 9088 500128 4294468736 1752 4 8898 4 461 1634
1
47 52
0 17 1 1640044 9768 497524 4294471336 2286 122 7716 122 372 1291
1
44 55
7 10 0 1638592 5376 499216 4294469664 2542 0 8028 0 362 1273
1
28 71
3 14 0 1638596 5104 501268 4294467600 2034 5802 5658 5818 508 773
2 33 65
0 17 0 1638596 5104 508920 4294459948 2156 0 5984 0 301 1001
3
10 86
1 16 1 1638596 9596 504088 4294464780 1680 4 8036 14 384 1362
3
50 47
1 16 0 1642104 5104 506576 4294462292 1836 102 7096 102 363 1208
1
46 53
0 17 0 1639868 5396 502784 4294466084 2092 2 6896 2 352 1180
1
35 64
12 5 1 1638596 9328 500612 4294468256 2446 0 9718 0 396 1444
1
52 47
0 17 0 1643432 7416 499428 4294469440 2150 102 7878 102 374 1277
1
41 57
0 17 0 1643564 8924 495780 4294473096 1882 222 8812 226 393 1353
0
58 42
2 15 1 1638604 9032 493140 4294475736 2070 168 9497 180 440 1607
2
51 47
0 17 0 1640508 8212 492768 4294476108 942 6960 5170 6972 470 872
2
38 60
0 18 0 1640468 8628 492324 4294476572 2 5654 208 5654 317 71
0
4 96
0 17 0 1638596 5104 497320 4294471640 708 0 3236 0 401 622 1
7 92

Test finished after 17 hours without problems.
Kernel 2.4.13 - ext2 filesystem - linux-2.4.11-aacraid-20011010.patch

r b w swpd free buff cache si so bi bo in cs us sy
id
1 16 0 900 750420 420 591156 0 0 24276 11 542 2219 51 23
26
2 15 0 900 505664 420 655032 0 0 21292 0 495 1732 42 31
27
1 16 0 900 425644 436 717364 0 0 20777 13 490 2247 52 12
36
5 12 0 900 420400 192 722236 0 0 24023 11 542 1715 49 31
21
2 15 0 900 235932 196 722252 0 0 26628 20 585 1929 37 43
20
3 14 0 900 235800 144 722436 0 0 22487 0 516 2084 50 20
30
2 15 0 900 235776 168 722432 0 0 25004 12 557 1872 50 30
20
3 14 0 900 236280 196 721928 0 0 27572 8 574 1643 46 39
15
2 15 0 900 52136 188 721572 0 0 25604 5 565 2034 38 37
24
8 9 0 900 51776 188 721952 0 0 24404 0 548 2226 49 26
25
4 13 0 900 52260 196 721452 0 0 25217 11 579 1822 39 46
15
4 13 0 900 52168 180 721592 0 0 25513 0 561 1657 42 42
16
4 13 0 900 4580 192 588264 0 0 25273 24 555 1819 36 43
21
3 14 0 900 5184 192 592492 0 0 21548 0 515 2079 51 20
30
3 15 0 900 4192 192 595980 0 0 22064 11 543 2002 49 22
29
5 12 0 900 5116 192 597856 0 0 25641 5 600 1624 47 35
18
4 13 0 900 5088 164 597924 0 0 25771 4 554 1695 48 35
17
1 16 0 900 4304 192 432596 0 0 27156 15 599 1967 35 44
20
2 15 0 900 5040 164 431856 0 0 25643 1 571 2130 50 24
26
2 15 0 900 4388 164 432500 0 0 25388 9 568 2142 50 22
28
1 16 0 900 4604 152 266208 0 0 25172 1 563 2021 51 23
27


Comments?

Best regards,
Joan
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