Date: Sat, 5 May 2007 10:18:06 -0700 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: "Marc G. Fournier" <freebsd@hub.org> Cc: pluknet <pluknet@gmail.com>, freebsd-stable@freebsd.org Subject: Re: swap zone exhausted, increase kern.maxswzone Message-ID: <20070505171806.GK17958@funkthat.com> In-Reply-To: <576837AA4FFCB91BF5B92A61@ganymede.hub.org> References: <5580F93A753EBAEF71B41EE7@ganymede.hub.org> <20070505160655.GA847@xor.obsecurity.org> <F7A69B1C2C53E12D2A2DCB1A@ganymede.hub.org> <a31046fc0705050935t631d034bm152fdd949565f3c2@mail.gmail.com> <576837AA4FFCB91BF5B92A61@ganymede.hub.org>
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Marc G. Fournier wrote this message on Sat, May 05, 2007 at 13:42 -0300:
> > On 05/05/07, Marc G. Fournier <freebsd@hub.org> wrote:
> >> # sysctl kern.maxswzone
> >> sysctl: unknown oid 'kern.maxswzone'
> >
> > It is a /boot/loader.conf variable, not in sysctl MIB.
>
> Hrmmm ... then how do I know what to increase it to, if I don't know what it
> currently set to? :( I thought all the /boot/loader.conf variables were
> viewable read only via sysctl ... ? kinda like nmbclusters:
>
> # sysctl -a | grep nmbcl
> kern.ipc.nmbclusters: 25600
>
> I can't set it via sysctl, it has to be in /boot/loader.conf ... but I can at
> least view its value ...
Take a peek at sys/kern/subr_param.c:
#ifdef VM_SWZONE_SIZE_MAX
maxswzone = VM_SWZONE_SIZE_MAX;
#endif
TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone);
and then:
crijmgmac,ttyp8,~/FreeBSD/HEAD/src/sys,507$find . -type f | xargs grep VM_SWZONE_SIZE_MAX
./amd64/include/param.h:#ifndef VM_SWZONE_SIZE_MAX
./amd64/include/param.h:#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
./boot/common/loader.8:.Dv VM_SWZONE_SIZE_MAX .
./conf/options:VM_SWZONE_SIZE_MAX opt_param.h
./i386/include/param.h:#ifndef VM_SWZONE_SIZE_MAX
./i386/include/param.h:#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
./kern/subr_param.c:#ifdef VM_SWZONE_SIZE_MAX
./kern/subr_param.c: maxswzone = VM_SWZONE_SIZE_MAX;
So, it appears that loader(8) isn't correct:
swap the system can support. This value is specified in
bytes of KVA space and defaults to around 70MBytes. Care
It appears that when dillion made the change almost 5 years ago, he
didn't update loader(8)... I'll fix that...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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