Date: Thu, 17 Oct 2013 16:26:16 +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: <20131017162616.70795c30@gumby.homeunix.com> In-Reply-To: <201310171404.r9HE4ouQ018448@mech-cluster241.men.bris.ac.uk> References: <201310171404.r9HE4ouQ018448@mech-cluster241.men.bris.ac.uk>
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On Thu, 17 Oct 2013 15:04:50 +0100 (BST)
Anton Shterenlikht wrote:
> I'm using a 72gb swap disk.
> I've 10gb RAM
>
> I get this warning:
>
> warning: total configured swap (8960911 pages) exceeds maximum
> recommended amount (8243200 pages). warning: increase kern.maxswzone
> or reduce amount of swap.
>
> What is max. recommended amount based on?
> What is the danger of exceeding it?
> How should I increase kern.maxswzone?
>
> # sysctl kern.maxswzone
> kern.maxswzone: 0
> #
>
> Do I set it to the total swap size?
> Where is kern.maxswzone described?
$ sysctl -d kern.maxswzone
kern.maxswzone: Maximum memory for swap metadata
see also loader(8)
However setting kern.maxswzone can only be used to reduce the metadata size below the default, not increase it.
from swap_pager.c:
n = cnt.v_page_count / 2;
if (maxswzone && n > maxswzone / sizeof(struct swblock))
n = maxswzone / sizeof(struct swblock);
n2 = n;
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