Re: syscons options and memory use

From: Peter Jeremy (PeterJeremy_at_optushome.com.au)
Date: 03/31/05

  • Next message: Mikhail Godovitcin: "USB JetFlash" 
    Date: Thu, 31 Mar 2005 19:17:52 +1000
To: Ronald Klop <ronald-freebsd8@klop.yi.org>

    On Thu, 2005-Mar-31 09:53:59 +0200, Ronald Klop wrote:
    >>In the last episode (Mar 31), Ronald Klop said:
    >>>The syscons manual page says:
    >>>" The following options will remove some features from the syscons
    >>> driver and save kernel memory.
    >>> [...]
    >>> SC_NO_SYSMOUSE
    >>> This option removes mouse support in the syscons driver.
    >>> The mouse daemon moused(8) will fail if this option is
    >>> defined. This option implies the SC_NO_CUTPASTE option
    >>> too.
    >>>"
    >>>
    >>>How much memory does this save (or how can I discover that)? Is it worth
    >>>it on a 96MB PentiumII laptop?

    It basically removes scmouse.c, sysmouse.c and a largish chunk of code in
    scvgarndr.c - my estimate is about 9KB. You can probably do better looking
    elsewhere. For loadable devices, looking at the module size is a good
    guideline.

    >How can I see the size of my kernel?

    server% size /boot/kernel/kernel
       text data bss dec hex filename
    3045945 229911 978784 4254640 40ebb0 /boot/kernel/kernel
    server%

    Remember that this doesn't include dynamic memory allocated by the
    kernel which can be quite significant. Look at the "real memory"
    and "avail memory" lines in your boot dmesg to get a better idea
    of the basic kernel memory requirements. 

    -- 
Peter Jeremy
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