[Asterisk-Users] Tuning the Linux kernel?

[Steven Critchfield]

On Thu, 2003-11-20 at 22:03, Adam Goryachev wrote:
> > What performance increase do you expect if you don't
> > load a module?  In theory you'd use less RAM but with
> > a modern VM system the disk sectors don't get mapped into
> > physical RAM unless the code is executed.  
> > 
> > Whenever Linux needs more RAM most of the time it simply
> > overwites the RAM used to hold the executable code used by
> > some program.  It doesn't even have to bother saving what
> > was over written because it can always re-read it from
> > the .so or executable file.  so these "extra modules" just
> > get over written anyways.  You save very little.
> > 
> > From a "it's nice to do" stand point trim it down but I'd like
> > to see hard measured performance numbers from before and
> > after.  I would actully expect trimmingwould help but likely
> > at the "second decimal place" level.
> 
> All true, but... It would be 'nice' from both a reliability as well as a
> security standpoint to start asterisk with a *MINIMUM* of modules, or at
> least to document in the sample config what is the minimum set of
> modules.
> 
> Ie, perhaps a parameter that says:
> Load all modules by default (which is set to true like now, but can be
> changed to no)
> Then one by one list each and every module, application, etc.
> Place the minimum required apps/modules at the top, and document it
> saying these are the minimum requirements.
> 
> This way, it is easy to start with the minimum and add what is needed,
> instead of starting with everything and slowly trying to remove what
> isn't needed (when often you aren't sure what you do/don't need).
> 
> To start asterisk, have it crash because xyz module isn't loaded, ok,
> load xyz module and retry. It's harder to remove a module one by one and
> see if it crashes (assuming you even manage to find the full list of
> them).

show modules

The list is easy, but you need to keep up after each cvs update.
-- 
Steven Critchfield <critch at basesys.com>