From owner-freebsd-stable  Sun Aug 22 23:33:51 1999
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Message-Id: <199908230632.QAA07992@nymph.detir.qld.gov.au>
To: Sheldon Hearn <sheldonh@uunet.co.za>
Cc: freebsd-stable@freebsd.org, obrien@FreeBSD.ORG,
	mi@aldan.algebra.com, syssgm@detir.qld.gov.au
Subject: Re: installworld : problem 1 (softupdates) 
References: <43184.935385968@axl.noc.iafrica.com>
In-Reply-To: <43184.935385968@axl.noc.iafrica.com>
    from Sheldon Hearn at "Mon, 23 Aug 1999 07:26:08 +0200"
Date: Mon, 23 Aug 1999 16:32:16 +1000
From: Stephen McKay <syssgm@detir.qld.gov.au>
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On Monday, 23rd August 1999, Sheldon Hearn wrote:

>On Fri, 20 Aug 1999 14:54:41 MST, "David O'Brien" wrote:
>
>> Softupdates doesn't buy you anything on reads -- just writes.  So unless
>> you have it turned on for / because /tmp is on /, you aren't getting
>> anything out of softupdates than frustration.
>
>Does softupdates score you something over MFS for /tmp ?

Possibly.  Because MFS pretends to be a real disk you often have 2 copies
of any block in memory, one for the MFS "disk", and one for the "in core"
copy.  You wouldn't have that problem with softupdates.

But, softupdates uses memory to keep track of the before and after versions of
things, so it's hard to tell if you would win.  Try it. :-)

By the way, I use MFS for /tmp and don't use softupdates for root.

Stephen.


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