Weird vmstat reports in 2.2.18

[albertogli@telpin.com.ar]

I'm getting some strange reports with vmstat on a dual iPPro running 2.2.18,
it doesnt happen very frequently, but i see it a lot when compiling something 
(kernel and mysql specially, not when compiling small stuff), though it doesnt 
look like a high-load issue. When the machine is idle (ie. most of the time at 
the moment) it doesnt show up.

The report is like this:
#vmstat 1 60 | awk '{ print $16 }'
id
0
0
20452224
1
20452224
0
1
20452224
1
0
0

I wasnt able to trigger it in a predictable way, it just pops up...
BUT if i open two vmstats in different consoles.. the number doesnt show up in 
both, just in one of them... so i'm not sure at all if this is a kernel bug, or 
just another (vmstat?) feature =)
I also found a reference to something similar in 
http://www.uwsg.iu.edu/hypermail/linux/kernel/0009.3/0273.html

       Alberto
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