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To: John Baldwin <jhb@freebsd.org>
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Cc: Julian Stacey <jhs@berklix.org>, "Jin Guojun \[VFFS\]" <j_guojun@lbl.gov>,
	freebsd-hardware@freebsd.org
Subject: Re: Real and available memory?
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John Baldwin wrote:
> On Wednesday 09 August 2006 16:34, Jin Guojun [VFFS] wrote:
>
> Please don't use HTML-only e-mail.
>
>   
>>> Well, that's where the missing 40 meg is. :)  The kernel text (including
>>> any modules and preloaded mfsroot's) aren't include in the 'avail memory'
>>> count.
>>>       
>> This is not where the memory goes.
>> The MFS root is probably not allocated yet at this point.
>>     
>
> Huh?  Of course it is!  You load it from /boot/loader into RAM at the same
> point when you load the kernel.  All of the kernel text plus any loaded
> modules are not considered available memory when 'avail memory' is output.
> (Along with a few other pages needed for things like crashdumps, some VM
> bootstrapping data structures, etc.)  You can't load a MFS root after the
> kernel is booted because if it's the root filesystem, there's no place for
> it to be loaded from once the kernel boots.
>
>   

Absolutely correct! I have decreased the size of mfsroot image with 4Mb and
available memory is 4Mb up.

Thanks for all replays