[Haifux] some additions and eratta to today's lecture

[guy keren]

On Mon, 2011-03-21 at 14:26 +0200, Nadav Har'El wrote:
> On Tue, Mar 15, 2011, guy keren wrote about "[Haifux] some additions and eratta to today's lecture":
> > 
> > 1. etzion asked about controlling the age of dirty pages before pdflush 
> >    flushes them - the default value is 30 seconds, and can be seen by:
> > 
> >     cat /proc/sys/vm/dirty_expire_centisecs
> > 
> >     (the time there is in milli-seconds). it can be changed by echoing
> > the desired time into that file, e.g. to change it to 40 seconds:
> > 
> >      echo 40 > /proc/sys/vm/dirty_expire_centisecs
> 
> Would I be wrong to assume that since the file name is "centisecs", it is
> indeed centisecs (1/100th of a second), neither milli-seconds nor seconds
> as you wrote above?

err.. you're right.

the default value is '3000', which amounts to 30 seconds,
so to set it to 40 seconds - one should echo "4000" into that file.

--guy