disk churn turn off thru .config how

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Intermittently my Linux spontaneously dedicates itself to persuading my
boot HDD make noise. Suddenly I'm living in a mode where new windows
open slowly, commands take a long time to complete. Usually I first try
`sync` to stop this. If that recovery doesn't work, then I `reboot`.

But today, at such a time, I recovered by more persistently repeating
`sync`, maybe a dozen times.

Is this intermittent churning of my disk somehow my fault? I run my own
kernels almost exclusively, so I have almost no comparative experience
of kernels built by people who know what they are doing. Google tells me
I do not suffer alone, and suggests I study /proc/meminfo.

Pat LaVarre
http://linux-pel.blog-city.com/read/617872.htm

P.S. Once while suffering, I recorded:

$ uname -r
2.6.6-bk6
$
$ time sync ; time sync ; time sync
real    0m5.657s ...
real    0m1.259s ...
real    0m39.157s ...
$

Also:

$ cat /proc/meminfo
MemTotal:       498792 kB
MemFree:          3728 kB
Buffers:         16912 kB
Cached:          32592 kB
...
Dirty:            5124 kB
Writeback:           0 kB
Mapped:         121720 kB
Slab:           344544 kB
Committed_AS:   133152 kB
PageTables:       1436 kB ...

Normal i.e. now without reboot is sync complete in 0.006s and different
/proc/meminfo

...
MemFree:          4332 kB
Buffers:          6148 kB
Cached:          75100 kB
...
Dirty:               0 kB
Writeback:           0 kB
Mapped:         175612 kB
Slab:           274460 kB
Committed_AS:   369668 kB
PageTables:       1704 kB ...



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