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Date: Mon, 03 Apr 2006 16:58:22 -0500
From: Alan Cox <alc@cs.rice.edu>
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To: Peter Wemm <peter@FreeBSD.org>
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Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/amd64/amd64 pmap.c src/sys/amd64/include
 pmap.h
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Peter Wemm wrote:

>peter       2006-04-03 21:36:01 UTC
>
>  FreeBSD src repository
>
>  Modified files:
>    sys/amd64/amd64      pmap.c 
>    sys/amd64/include    pmap.h 
>  Log:
>  Shrink the amd64 pv entry from 48 bytes to about 24 bytes.  On a machine
>  with large mmap files mapped into many processes, this saves hundreds of
>  megabytes of ram.
>  
>
[snip]

Have you run any performance tests?

Alan