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From: Christoph Rohland <cr@sap.com>
To: Padraig Brady <padraig@antefacto.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: ramdisk/tmpfs/ramfs/memfs ?
In-Reply-To: <3AE879AE.387D3B78@antefacto.com>
Organisation: SAP LinuxLab
Date: 27 Apr 2001 09:58:47 +0200
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Hi Padraig,

On Thu, 26 Apr 2001, Padraig Brady wrote:
> 2. Is tmpfs is basically swap and /tmp together in a ramdisk?
>    The advantage being you need to reserve less RAM for both
>    together than seperately?

tmpfs is ramfs+swap+limits. It is not using ramdisks and is not
related to them.

> 3. If I've no backing store (harddisk?) is there any advantage 
>    of using tmpfs instead of ramfs? Also does tmpfs need a 
>    backing store?

Probably yes, since you spare a little bit kernel memory. most of
tmpfs is unconditionally in the kernel for shared mappings. So the
actual CONFIG_TMPFS only adds some small functions to the kernel to
export this to usre space.

Greetings
		Christoph


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