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To: Tony Jones <tony@thing.sunquest.com>
cc: questions@freebsd.org
Subject: Re: Where does all the memory go ? 
In-reply-to: Your message of "Fri, 16 Feb 1996 11:30:38 MST."
             <9602161830.AA20449@thing.sunquest.com> 
From: David Greenman <davidg@Root.COM>
Reply-To: davidg@Root.COM
Date: Fri, 16 Feb 1996 11:15:32 -0800
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>That is a total of just over 20MB.
>
>Clearly, the kernel takes up some unaccounted for space. Does the UBC also ?
>or since it is integrated with the VM system, is buffer cache use reflected in
>the vmstat output ?
>
>Just looking for some information on how to better account for memory usage,
>or to figure for the missing 12MB. Or maybe using PS rss + VMSTAT free + kernel
>space is not a valid measurement technique ?
>
>I guess I was slightly surprised to see only 11MB on the free list in the
>above situation.

   "Free" memory consists of free and cached pages. See the output of
'vmstat -s' for the "pages in VM cache". In general, this is the number of
pages that contain cached file data.

-DG

David Greenman
Core Team/Principal Architect, The FreeBSD Project