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Date:      Fri, 18 Oct 2013 15:23:55 +0100
From:      RW <rwmaillists@googlemail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: warning: total configured swap (8960911 pages) exceeds maximum recommended amount (8243200 pages).
Message-ID:  <20131018152355.69447de7@gumby.homeunix.com>
In-Reply-To: <201310181254.r9ICshUi050154@mech-cluster241.men.bris.ac.uk>
References:  <20131018134153.4dc44e93@gumby.homeunix.com> <201310181254.r9ICshUi050154@mech-cluster241.men.bris.ac.uk>

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On Fri, 18 Oct 2013 13:54:43 +0100 (BST)
Anton Shterenlikht wrote:


> Looking at the article
> ( http://blog.frankleonhardt.com/2011/large-swap-files-on-freebsd-die-with-mystery-killed-howto-add-lots-of-swap-space/
> ) the default value of kern.maxswzone has also
> changed meaning.
> 
> On r256683 I get:
> 
> # sysctl kern.maxswzone
> kern.maxswzone: 0
> #
> 
> So I'm not sure, do I set this variable
> to the *total* swap size? 

It would be the metadata size.

> Or to the excess, above the "maximum
> recommended amount" reported by dmesg?


As I pointed out before, you can only use kern.maxswzone to reduce the
size below the default.

Actually I think you're going to be OK. I had a look at the code that
generated the warning: "total configured swap (8960911 pages)
exceeds maximum recommended amount (8243200 pages)." The recommended
limit is half the theoretical maximum, so you're just reducing the
safety margin by 9%.



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