How to produce dirty space

[Bernhard Priewasser]

 > For the information when things are flushed see "/proc/sys/vm - the
 > virtual memory subsystem" at Documentation/filesystems/proc.txt.

Got it:

 > [/proc/sys/vm/]dirty_writeback_centisecs
 > ----------------------------------------
 >
 > The pdflush writeback daemons will periodically wake up and write
 > `old' data out to disk.  This tunable expresses the interval between
 >  those wakeups, in 100'ths of a second.

Thanks,
-- 
Bernhard