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To: Andy Farkas <andyf@speednet.com.au>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Sat, 02 Aug 2003 22:46:20 +1000."
             <20030802221832.S41132-100000@hewey.af.speednet.com.au> 
Date: Sat, 02 Aug 2003 15:46:45 +0200
Message-ID: <10603.1059832005@critter.freebsd.dk>
cc: arch@freebsd.org
Subject: Re: headsup: swap_pager.c 
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In message <20030802221832.S41132-100000@hewey.af.speednet.com.au>, Andy Farkas
 writes:
>Poul-Henning Kamp wrote:
>
>> Setting NSWAPDEV=1 is not an option, because that means that
>> administrators which find themselves in a pinch can not add another
>> swap-space to ride off a storm.
>
>You still are not explaining why the current code is wrong. You say
>"bogo-vnode". Please explain what that means.

A bogos vnode.

>What does "in a pinch" mean??

That for instance you are running out of swap, if NSWAPDEV==1 you cannot
add another swapdev because the one and only slot is occupied (and the
device is filled too).

>What do those numbers in kern.malloc mean??

That the corresponding amount of RAM is unchangably occupied by a table
which is 3/4 empty and therefore nothing else can use that RAM productively.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.