Hi, On one of my systems I have set dirty_writeback_centisecs to 2500. Because it does not exactly match the powertop magic value of 1500 the powertop reports it as a Bad value. Would it be possible to modify the code to accept anything >= 1500 as Good? I checked out the source code and the value seems to come from here: In src/tuning/tuning.cpp: add_sysfs_tunable(_("VM writeback timeout"), "/proc/sys/vm/dirty_writeback_centisecs", "1500"); Maybe it would be possible to add an optional flag at the end to specify the comparision function(eg. == > >= < <=) ? -Mikko