> The time that the kernel takes for checking usernames is about one second on 
quoted text
> my laptop which is equipped with an intel centrino 1,7GHz.

The kernel doesn't do anything with usernames. Most likely your user
space login programs are configured with an intentional delay to stop
dictionary attacks.
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/