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Date:      Wed, 13 Feb 2008 10:33:39 +0200
From:      Ian FREISLICH <ianf@clue.co.za>
To:        Eygene Ryabinkin <rea-fbsd@codelabs.ru>
Cc:        Ken Smith <kensmith@cse.Buffalo.EDU>, freebsd-current@freebsd.org
Subject:   Re: FreeBSD 7.0-RC2 Available 
Message-ID:  <E1JPD3j-0000wk-6u@clue.co.za>
In-Reply-To: Message from Eygene Ryabinkin <rea-fbsd@codelabs.ru> of "Wed, 13 Feb 2008 11:11:58 %2B0300." <HNc5KTwAOlChZd/l%2BN1vPPiVFRE@3SQePivZkcJXerr/O1l2SLu1NoU> 

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Eygene Ryabinkin wrote:
> Ian,
> 
> Wed, Feb 13, 2008 at 09:59:09AM +0200, Ian FREISLICH wrote:
> > I selected auto defaults for the slice editor.  The system I installed
> > (amd64) on has 16GB of RAM yet it only assigned 4GB for swap.  I
> > remember reading that on amd64 minidumps could corrupt neighbouring
> > filesystems, so a full dump could be up to 16GB.  There won't be
> > enough space for a full dump.  That said, 16GB is quite a *lot* to
> > swap out and I'm not sure how the system would perform under that
> > scenario.
> > 
> > What's the prevailing wisdom?  Is this a variable storage type bug
> > in the installer - int in stead of an off_t or size_t?
> 
> It is the limitation in the code, introduced in revision 1.111:
>   http://www.freebsd.org/cgi/cvsweb.cgi/src/usr.sbin/sysinstall/label.c.diff?r1=1.110;r2=1.111
> ----
> +/*
> + * Swap size limit for auto-partitioning (4G).
> + */
> +#define SWAP_AUTO_LIMIT_SIZE		4096
> -----

Thanks.  That answers about half the question.  Is there any sense
in making the swap partition bigger than that?  When I started using
FreeBSD the rule of thumb was 2.1*physical RAM.  I'm not sure that
holds true any more.

Ian

--
Ian Freislich




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