Mailinglist Archive: opensuse-amd64 (380 mails)

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Curious behavior with KSWAPD
  • From: "Bedard, Joe" <Joe.Bedard@xxxxxxxxxxxx>
  • Date: Sat, 7 Feb 2004 01:40:37 +0000 (UTC)
  • Message-id: <0E8DCC1D8AA0FD40BC9BFADE036E0F1C2635@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Greetings:

Kswapd on my SLES 8 whipsaws one of my CPU's to 99.9% for prolonged
periods of time during high I/O.
While this activity is happening, performance and interactive response
time goes by way of the swamp.

Any ideas on a workaround?
Or shall I call for an exorcist? :)

Kernel: 2.4.21-185-smp for AMD64

# vmstat 15
procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us sy
id wa
1 3 312120 5867896 35876 19916 3 2 287 145 4 3 9
0 90 0
1 3 312168 5877016 36220 11832 764 716 16148 728 1294 1761 1
28 72 0
1 6 312228 5867660 36036 18520 2512 316 19864 316 1318 1853 1
28 71 0
1 3 312196 5876848 35836 12200 1084 1972 20998 2026 1887 1901 1
29 70 0
1 3 312180 5875688 36044 13548 728 440 16824 454 1165 1672 1
26 73 0
1 4 312188 5873016 35956 15848 1176 308 21140 308 1462 1852 1
27 71 0
2 2 312168 5878064 35868 11228 1438 598 20180 636 1471 1789 1
27 72 0
1 4 312196 5870220 35708 18872 1502 278 23968 278 1382 1892 1
28 71 0
1 3 312196 5870716 35888 17908 1494 472 25568 484 1683 2038 1
28 71 0
2 4 312188 5875772 35784 14068 998 570 18276 606 1217 1783 1
27 72 0
1 3 312200 5870384 35724 18780 1698 316 30080 316 1957 2185 2
29 69 0
1 4 312192 5871160 35940 17648 1572 676 24746 688 1771 1931 1
29 71 0
2 3 312184 5875620 35964 13664 848 466 16980 520 1249 1702 1
27 72 0
1 7 312216 5869276 35912 19860 1544 316 22562 316 1379 1845 1
28 70 0
1 4 312160 5873284 35516 13440 2870 618 27232 632 1987 2215 5
29 66 0
1 3 312200 5874528 36096 14328 1252 1752 18698 1798 1471 1654 1
27 72 0
2 3 312220 5872704 35808 15972 1242 646 27400 658 1942 1959 1
29 70 0
1 4 312196 5875308 36096 13628 874 506 16932 518 1208 1655 1
28 71 0


TOP

Tasks: 100 total, 2 running, 98 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.7% user, 27.8% system, 0.0% nice, 71.5% idle
Mem: 7873748k total, 1995220k used, 5878528k free, 36072k buffers
Swap: 4200956k total, 310804k used, 8091108k free, 10976k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
11 root 25 0 0 0 0 R 99.9 0.0 106:14.98 kswapd
9409 oracle 15 0 1586m 1.4g 1.4g D 4.2 19.2 42:20.19 oracle
6204 oracle 15 0 1160m 1.1g 1.1g D 3.9 15.0 0:37.22 oracle
5488 oracle 15 0 967m 962m 962m S 2.3 12.5 0:31.33 oracle
9407 oracle 15 0 1568m 1.4g 1.4g D 1.6 18.9 37:41.11 oracle
6256 oracle 16 0 456 304 276 R 0.6 0.0 0:00.26 top
9426 oracle 21 5 4880 0 0 S 0.3 0.0 0:00.05 dbsnmp
9439 oracle 20 5 4880 0 0 S 0.3 0.0 0:03.61 dbsnmp
9440 oracle 20 5 4880 0 0 S 0.3 0.0 0:09.36 dbsnmp
6173 oracle 15 0 192m 190m 190m S 0.3 2.5 0:06.96 oracle
1 root 15 0 48 0 0 S 0.0 0.0 0:14.94 init
2 root RT 0 0 0 0 S 0.0 0.0 0:00.00
migration_CPU0
3 root RT 0 0 0 0 S 0.0 0.0 0:00.00
migration_CPU1
4 root RT 0 0 0 0 S 0.0 0.0 0:00.00
migration_CPU2
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00
migration_CPU3
6 root 15 0 0 0 0 S 0.0 0.0 105:58.96 keventd
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