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Why Linux uses swap instead of RAM?

SergeyBFeb 6 2008 — edited Feb 15 2008

Hello, all.

I have:
- Enterprise Linux on a server with 2Gb RAM
- 2Gb swap
- 2 Oracle databases (1000M and 400M SGA)
- very poor performance

The following shows that Linux prefers using swap instead of RAM.

[root@sigma etc]# free
total used free shared buffers cached
Mem: 2074920 1913728 161192 0 380 1233520
-/+ buffers/cache: 679828 1395092
Swap: 2097112 1307636 789476

[root@sigma etc]# sar -B 1 100
Linux 2.6.9-55.0.0.0.2.ELsmp (sigma.inline.ru) 02/06/2008

06:00:34 PM pgpgin/s pgpgout/s fault/s majflt/s
06:00:35 PM 5665.31 2689.80 3634.69 215.31
06:00:36 PM 5955.56 1464.65 4089.90 281.82
06:00:37 PM 6329.90 2042.27 8905.15 285.57
06:00:38 PM 9636.36 353.54 6952.53 294.95
06:00:39 PM 5787.76 168.37 5302.04 208.16
06:00:40 PM 6987.76 118.37 3485.71 262.24
06:00:41 PM 6238.38 210.10 5519.19 335.35
06:00:42 PM 34224.49 824.49 6241.84 260.20

Value of "buffers" has never exceeded 1G.

Could somebody suggest me how to improve the situation?

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Locked on Mar 14 2008

Added on Feb 6 2008

#generic-linux, #linux

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