Verifying module

[Mulyadi Santosa]

Hi...

On Mon, Jan 3, 2011 at 20:06, Mag Gam <magawake at gmail.com> wrote:
> We are planning to deploy a system for a client. I was told that
> leaving unnecessary modules (ie. jfs, usb, etc...) will not cause
> latencies in the kernel however the client is very sensitive.

That is right...module is only loaded as needed..

>They
> care about latencies in microseconds and I was wondering if leaving
> unnecessary modules loaded would cause it

if you just "leave" them, it wouldn't add any overhead IMHO. Only if
it is loaded. For that, you could either blacklist them or
better....deselect them during kernel config. Whichever suits you
better

PS: If you're really sensitive, perhaps you could make all of your
modules build into the kernel image...therefore there won't be any
modules. But beware, the kernel image will be damn big :)

>and how can I measure the
> kernel latency (with lmbench if possible) w/o necessary modules.

what latency are we talking here? scheduling latency?

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com