OK, this test one is sles9x (2.6.5-7.286-s390x) - was6.1.. Idle.
Using 901MB Swap space (on 4 vdisks)
And like 217M in the cache
I decided to see if I could make the cache go away.
I set vm.swappiness=0
Then I did swapoff / swapon 1 vdisk at a time
It cleared up the swap space - taking it down to 69MB total
It also took the buffers and cache down to about 110MB total
So, if I'm understanding right, those would be dirty pages no longer
needed hanging out there in swap? I thought the point of the priortized
swap was that it'd keep reusing those on the highest numbered disks
before starting down to the next disk. It was well into the 3rd disk
(they are like 250M, 500M, 1G, 1G). (at least I think it used to work
that way!). Could there be a linux bug here?
Seems like vm.swappiness=0 (or a least a lower number than the default
of 60) would be a good setting for Linux under VM. Has anyone studied
this?
------------------------------------------------------------------------
--------------------------------
1 of 2 LINUX UCD Memory Analysis Report NODE LNX132 LIMIT 50
2094 6784A
<------------------Storage sizes in MegaBytes ------->
<--Real Storage--> Over <-----SWAP Storage----> Total
Time Node Total Avail Used head Total Avail Used MIN Avail
-------- -------- ------ ----- ----- ----- ----- ----- ----- ----- -----
15:14:00 LNX132 1464.7 7.3 1457 1346 3662 3592 69.8 15.6 3600
15:13:00 LNX132 1464.7 7.9 1457 1346 3662 3592 69.8 15.6 3600
15:12:00 LNX132 1464.7 6.0 1459 1351 3662 3592 69.9 15.6 3598
15:11:00 LNX132 1464.7 5.6 1459 1346 3662 3593 69.2 15.6 3599
15:10:00 LNX132 1464.7 7.6 1457 1346 3662 3588 74.4 15.6 3595
15:09:00 LNX132 1464.7 8.2 1456 1349 3662 3588 74.4 15.6 3596
15:08:00 LNX132 1464.7 3.5 1461 1351 3449 3359 90.2 15.6 3363
15:07:00 LNX132 1464.7 6.3 1458 1342 3536 3382 153.3 15.6 3389
15:06:00 LNX132 1464.7 6.9 1458 1293 3637 3408 229.1 15.6 3415
15:05:00 LNX132 1464.7 7.0 1458 1279 3662 3409 253.0 15.6 3416
15:04:00 LNX132 1464.7 6.7 1458 1278 2197 1944 253.0 15.6 1951
15:03:00 LNX132 1464.7 5.4 1459 1255 2395 1953 441.9 15.6 1958
15:02:00 LNX132 1464.7 7.0 1458 1237 2686 2059 626.3 15.6 2066
15:01:00 LNX132 1464.7 5.9 1459 1210 2739 2059 679.7 15.6 2065
15:00:00 LNX132 1464.7 4.8 1460 1183 2890 2059 830.5 15.6 2064
14:59:00 LNX132 1464.7 6.0 1459 1173 3662 2760 901.6 15.6 2766
14:58:00 LNX132 1464.7 7.2 1457 1169 3662 2760 901.6 15.6 2768
14:57:00 LNX132 1464.7 5.5 1459 1169 3662 2760 901.6 15.6 2766
14:56:00 LNX132 1464.7 8.6 1456 1169 3662 2760 901.6 15.6 2769
14:55:00 LNX132 1464.7 8.9 1456 1169 3662 2760 901.6 15.6 2769
14:54:00 LNX132 1464.7 8.9 1456 1169 3662 2760 901.6 15.6 2769
14:53:00 LNX132 1464.7 6.2 1458 1169 3662 2760 901.6 15.6 2767
14:52:00 LNX132 1464.7 6.3 1458 1169 3662 2760 901.6 15.6 2767
14:51:00 LNX132 1464.7 6.4 1458 1169 3662 2760 901.6 15.6 2767
14:50:00 LNX132 1464.7 6.4 1458 1169 3662 2760 901.6 15.6 2767
14:49:00 LNX132 1464.7 6.6 1458 1169 3662 2760 901.6 15.6 2767
14:48:00 LNX132 1464.7 6.7 1458 1169 3662 2760 901.6 15.6 2767
14:47:00 LNX132 1464.7 7.5 1457 1169 3662 2760 901.6 15.6 2768
14:46:00 LNX132 1464.7 6.8 1458 1169 3662 2760 901.6 15.6 2767
14:45:00 LNX132 1464.7 6.4 1458 1170 3662 2760 901.6 15.6 2767
14:44:00 LNX132 1464.7 6.6 1458 1169 3662 2760 901.6 15.6 2767
14:43:00 LNX132 1464.7 6.7 1458 1169 3662 2760 901.6 15.6 2767
14:42:00 LNX132 1464.7 6.8 1458 1170 3662 2760 901.6 15.6 2767
2 of 2 LINUX UCD Memory Analysis Report NODE LNX132 LIMIT 50
2094 6784A
<------------------Storage sizes (in Megabytes)
------>
<--Real Storage--> <--Storage in Use-> Error
Time Node Total Avail Used Shared Buffer Cache Message
-------- -------- ------ ----- ----- ------ ------ -----
----------------
15:14:00 LNX132 1464.7 7.3 1457 0.0 6.4 105.3
15:13:00 LNX132 1464.7 7.9 1457 0.0 6.2 105.0
15:12:00 LNX132 1464.7 6.0 1459 0.0 5.7 102.2
15:11:00 LNX132 1464.7 5.6 1459 0.0 4.9 107.8
15:10:00 LNX132 1464.7 7.6 1457 0.0 5.1 106.0
15:09:00 LNX132 1464.7 8.2 1456 0.0 4.8 103.1
15:08:00 LNX132 1464.7 3.5 1461 0.0 5.2 105.3
15:07:00 LNX132 1464.7 6.3 1458 0.0 4.6 111.5
15:06:00 LNX132 1464.7 6.9 1458 0.0 17.7 147.5
15:05:00 LNX132 1464.7 7.0 1458 0.0 20.6 157.8
15:04:00 LNX132 1464.7 6.7 1458 0.0 20.5 159.1
15:03:00 LNX132 1464.7 5.4 1459 0.0 27.5 176.4
15:02:00 LNX132 1464.7 7.0 1458 0.0 32.7 187.7
15:01:00 LNX132 1464.7 5.9 1459 0.0 56.1 192.7
15:00:00 LNX132 1464.7 4.8 1460 0.0 67.5 209.0
14:59:00 LNX132 1464.7 6.0 1459 0.0 71.8 214.2
14:58:00 LNX132 1464.7 7.2 1457 0.0 71.7 216.3
14:57:00 LNX132 1464.7 5.5 1459 0.0 71.7 218.5
14:56:00 LNX132 1464.7 8.6 1456 0.0 71.7 215.5
14:55:00 LNX132 1464.7 8.9 1456 0.0 71.6 215.6
14:54:00 LNX132 1464.7 8.9 1456 0.0 71.6 215.6
14:53:00 LNX132 1464.7 6.2 1458 0.0 71.5 217.6
14:52:00 LNX132 1464.7 6.3 1458 0.0 71.5 217.7
14:51:00 LNX132 1464.7 6.4 1458 0.0 71.5 217.7
14:50:00 LNX132 1464.7 6.4 1458 0.0 71.4 217.7
14:49:00 LNX132 1464.7 6.6 1458 0.0 71.4 217.8
14:48:00 LNX132 1464.7 6.7 1458 0.0 71.4 217.3
14:47:00 LNX132 1464.7 7.5 1457 0.0 71.3 217.3
14:46:00 LNX132 1464.7 6.8 1458 0.0 71.3 217.4
14:45:00 LNX132 1464.7 6.4 1458 0.0 71.3 217.4
Marcy Cortes
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