Average load extremely high, no cpu used

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Hi, I noticed this behavior on one of my server (mail server, postfix + amavisd + spamassassin, 2,8ghz Xeon, kernel 2.6.9-1.681_FC3smp).

Here's the output of top command:

top - 15:04:35 up 4 days, 6:33, 2 users, load average: 15.00, 15.03, 15.05
Tasks: 160 total, 1 running, 159 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2% us, 0.2% sy, 0.0% ni, 99.7% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 505484k total, 405564k used, 99920k free, 10836k buffers
Swap: 1052152k total, 33032k used, 1019120k free, 62548k cached



Here's vmstat 3:
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 33032 100112 10924 62720 1 1 5 36 8 36 1 0 99 0
0 0 33032 100112 10936 62708 0 0 0 56 1022 126 0 0 100 0
0 0 33032 100112 10944 62700 0 0 0 29 1032 133 0 0 100 0
0 0 33032 100112 10952 62692 0 0 0 64 1040 124 0 0 100 0
0 0 33032 99336 10988 62656 0 0 0 97 1053 214 0 1 99 0


The machine is apparently under NO load, NO cpu used, all services run at great speed (postfix, samba, webmin) and no apparent problems.

Any clues/suggestions?


-- Andrea Gangini, Mimesi S.r.l. a.gangini@xxxxxxxxxx Tel. 0521/463811


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