Drop cache has no effect?

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

Hello,


recently I picked up knowledge of /proc/sys/vm/drop_caches 
(http://lkml.org/lkml/2006/8/4/95)

It does not always work right away:

(/U is a vfat, that is, permissions are back to 755 as soon as the caches 
are gone)
14:51 gwdg-wb04A:/U # chmod 644 *
14:51 gwdg-wb04A:/U # sync
14:51 gwdg-wb04A:/U # echo 2 >/proc/sys/vm/drop_caches 
14:51 gwdg-wb04A:/U # l
total 50713
drwxr-xr-x   3 jengelh users     2048 2006-08-29 14:48 .
drwxr-xr-x  22 root    root      4096 2006-08-25 14:00 ..
drw-r--r--   2 jengelh users     2048 2006-08-29 13:55 as
-rw-r--r--   1 jengelh users 13806629 2006-08-29 14:00 all-20060611.tar.bz2
-rw-r--r--   1 jengelh users 37816633 2006-07-28 19:25 
inkscape-0.44-2.guru.suse101.i686.rpm
-rw-r--r--   1 jengelh users   297243 2006-08-15 01:13 
vmware-any-any-update104.tar.gz

Remains 644.



Jan Engelhardt
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