From owner-freebsd-arch  Tue Oct  8  8:48:28 2002
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Date: Tue, 08 Oct 2002 08:46:44 -0700
From: Terry Lambert <tlambert2@mindspring.com>
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To: "Vladimir B. Grebenschikov" <vova@sw.ru>,
	Mikhail Teterin <mi+mx@aldan.algebra.com>, arch@FreeBSD.org
Subject: Re: using mem above 4Gb was: swapon some regular file
References: <200210071630.42512.mi+mx@aldan.algebra.com> <1034074876.917.23.camel@vbook.express.ru> <3DA2F716.C5B69C7C@mindspring.com> <3DA2FC9F.22C66877@mindspring.com>
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Oops.  Divided by 4 on the page tables.  Still a hell of a lot of
your available memory.

-- Terry

Terry Lambert wrote:
> 
> Terry Lambert wrote:
> > So whatever connections you are getting now... halve that, or less,
> > to get a window for your RAM disk (you will need KVA for mappings
> > for all the memory that *can* be in the window, etc.).
> 
> To emphasize this: if you are using 4K pages, you will need:
> 
>         4K/1M * 64G = 256M
> 
> ...1/4 of 1G of memory outside the window, just for page tables.
> 
> Also, if we still were using an mbuf per connection for the
> template, for 1,000,000 connections, that's 256M of RAM -- another
> 1/4 gig.
> 
> Yeah, most people don't think in these terms; personally, I like
> to call it "Extreme BSD".  8-).
> 
> -- Terry
> 
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