From owner-freebsd-hackers  Wed Jul  7 16:11: 0 1999
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To: Matthew Dillon <dillon@apollo.backplane.com>
Cc: freebsd-hackers@FreeBSD.ORG, freebsd-current@FreeBSD.ORG
Subject: Re: Heh heh, humorous lockup 
In-reply-to: Your message of "Wed, 07 Jul 1999 15:56:12 PDT."
             <199907072256.PAA94642@apollo.backplane.com> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Wed, 07 Jul 1999 16:09:46 -0700
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>:   Yes, I do - at least with the 512MB figure. That would be half of the 1GB
>:KVA space and large systems really need that space for things like network
>:buffers and other map regions.
>:
>:-DG
>:
>:David Greenman
>:Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org
>:Creator of high-performance Internet servers - http://www.terasolutions.com
>
>    What would be an acceptable upper limit?  256MB?  128MB?   The test 
>    I ran (Kirk's news test) ate around 60MB for the "FFS Node" memory area
>    before the number of vnodes stabilized, on a 1GB machine.  I would say
>    that a 128MB upper limit would be too small for a 4G machine.  A 256MB
>    limit ought to work for a 4G machine
>
>    Since most of those news files were small, I think Kirk's news test code
>    is pretty much the worse case scenario as far as vnode allocation goes.

   Well, I could possibly live with 256MB, but the vnode/fsnode consumption
seems to be getting a bit silly in the memory overhead department, even for
machines with 4GB of RAM. It seems like there needs to be fewer of them
and/or they need to go on a diet.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org
Creator of high-performance Internet servers - http://www.terasolutions.com


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