Date: Fri, 11 Aug 2000 01:42:37 -0700 (PDT) From: "Nicole Harrington." <nicole@unixgirl.com> To: Brian Fundakowski Feldman <green@FreeBSD.org> Cc: dillon@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG, Doug Barton <DougB@gorean.org>, Adam <bsdx@looksharp.net> Subject: Re: /tmp on a ramdisk? Message-ID: <XFMail.000811014237.nicole@unixgirl.com> In-Reply-To: <Pine.BSF.4.21.0007301541480.36725-100000@green.dyndns.org>
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On 30-Jul-00 Brian Fundakowski Feldman wrote:
> The issue is that mount_mfs is simply newfs with a catch: it
> constructs the new filesystem completely in memory and lives on as
> the storage for the mounted filesystem. If you view the processes on
> a system using MFS, you will notice that one of them is the original
> mount_mfs, having become a daemon.
>
> Yes, things are stored twice in memory: once in the buffer cache and
> once in the MFS process. Yes, they are also copied multiple times.
> MFS simply can't perform as well as you might expect. The malloc disk
> device can because it simply creates a kernel-memory backing store.
> The disadvantage here is that it's wired memory and can't get swapped
> out like mount_mfs can.
>
> --
> Brian Fundakowski Feldman \ FreeBSD: The Power to Serve! /
> green@FreeBSD.org `------------------------------'
>
>
Please forgive my late reply.. Just trying to catch up..
Given all of the above statements, why does BSD/OS (at least on 4.0 and 4.1)
want to set up tmp as a Ramdisk? I don't even think there is a way around it
during the install.
Nicole
>
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