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Date:      Wed, 16 Jan 2008 10:28:06 -0600
From:      Dan Nelson <>
To:        Albert Shih <>
Subject:   Re: How manu swap ?
Message-ID:  <>
In-Reply-To: <>
References:  <>

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In the last episode (Jan 16), Albert Shih said:
> Hi all
> I known it's classic question. 
> Long time ago when I install a FreeBSD x86 32 bits when I have N Go
> of Ram the installer take 2xN Go for the swap partition.
> Now I just install two machine with FreeBSD amd64 version with 8Go of
> Ram and FreeBSD installer take 4 Go of swap.
> Is a bug in the installer or now FreeBSD don't need 2xRam of swap ?

When was the last time you saw your swap partition with more than 2GB
in use?  On an 8GB system, you probably will either never have enough
processes to require swapping at all, or you will have one or two
processes so big that if they ever swap, it's a sign you need more RAM,
not more swap :)  In systems with that much RAM, swap is pretty much
only used for crashdumps, and with minidumps enabled by default, you
don't need much.  On small systems, the 2x-swap rule was because once
you allocated enough processes to require that much swap, you were
pretty much thrashing your system anyway.

	Dan Nelson

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