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Subject2.4.19rc2aa1 VM too aggressive?
I recently upgraded a web server I run to a the 2.4.19rc2aa1 kernel to
see how much better the VM is.

It seems to be better than the older 2.4 kernels used on this machine,
but there seems to be lots of motion in the cache for all of the free
memory that exists:

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
8 0 1 106764 460152 10688 102432 0 0 76 0 971 620 55 44 1
12 0 3 106764 321564 10712 237828 0 0 16 296 1286 860 34 65 0
2 1 0 106760 529488 10712 42284 4 0 4 0 707 481 28 72 0
7 0 0 106760 529496 10736 42468 0 0 204 0 1105 730 28 17 56
5 0 0 106760 515220 10740 53544 0 0 152 0 1237 929 50 22 29
5 0 0 106760 525364 10740 42680 0 0 32 0 918 611 50 29 21
2 0 1 106756 527248 10772 42672 0 0 4 308 994 692 52 32 17
10 1 1 106744 486112 10776 78788 192 0 300 0 1127 638 75 24 2
3 0 1 106744 517516 10776 49696 0 0 4 0 1005 623 55 45 0
4 0 0 106128 528812 10780 42992 0 0 192 0 644 367 13 22 65
3 0 0 106128 527444 10804 43012 0 0 12 276 561 386 16 14 70
1 0 1 106108 527540 10804 43412 8 0 8 0 1224 794 40 47 13
4 0 0 106108 510192 10804 59356 0 0 4 0 481 322 21 17 61
3 0 0 106076 527712 10812 43476 0 0 64 0 1333 968 46 38 16
3 0 0 106036 502288 10812 67236 0 0 0 0 802 494 46 37 17
5 0 2 106032 476188 10844 91496 0 0 4 316 905 573 54 37 8
16 0 2 106032 355400 10844 203880 0 0 4 0 909 540 51 49 0
10 0 2 106024 340108 10852 221548 0 0 28 0 975 659 36 64 0
0 0 0 106024 528340 10852 43572 0 0 4 0 569 426 17 17 67
0 1 0 106024 531304 10852 43612 0 0 4 0 542 342 9 14 77
16 0 1 106024 452508 10876 111588 0 0 20 308 986 621 49 38 13
procs memory swap io system
cpu
r b w swpd free buff cache si so bi bo in cs us sy id
26 0 1 106024 326064 10884 226384 0 0 324 0 1347 841 52 48 0
21 0 1 106016 241296 10896 308532 4 0 56 0 1154 737 53 46 1
15 6 1 137612 51136 8432 480368 40 1700 412 2044 3657 2514 31 69 0
12 22 0 115336 490416 8216 85448 0 1256 52 1320 381 7918 8 92 0
23 0 1 115260 435232 8252 133128 52 24 1168 292 2158 3848 43 47 10
11 0 1 115228 451688 8252 120776 0 0 76 0 1261 775 46 54 0
9 0 1 115180 454820 8296 118996 36 0 1532 0 1844 1530 52 48 0
11 0 1 115176 445800 8340 124312 128 0 656 412 892 796 48 52 0
9 0 1 114916 463744 8352 111960 12 0 452 0 708 673 23 77 0
6 0 1 114888 465108 8356 110332 24 0 248 0 745 696 33 67 0
12 0 1 114876 513064 8356 63196 0 0 420 0 1113 825 41 59 0
2 1 0 114876 550504 8368 28976 0 0 772 0 1614 1066 51 48 1
2 0 0 114868 558216 8408 21820 0 0 220 432 1453 1269 49 27 24
1 0 0 114868 566768 8412 14456 0 0 288 0 909 674 41 17 43
1 0 0 114864 565844 8428 14640 0 0 108 0 920 744 39 13 49

This is with a 1 second interval. Why is it that most of the time I have
~400MB of memory free (this machine has 1GB of memory). Why does the
cache size vary so wildly?

This machine is busy, as you can see, but it looks like the VM is trying
to be a bit too aggressive here.

Any ideas?

JE

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