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From: John Baldwin <jhb@freebsd.org>
To: "Dag-Erling =?utf-8?q?Sm=C3=B8rgrav?=" <des@des.no>
Date: Fri, 24 Aug 2012 07:48:19 -0400
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	(bigwig.baldwin.cx); Fri, 24 Aug 2012 08:36:24 -0400 (EDT)
Cc: alc@freebsd.org, freebsd-current@freebsd.org,
	Colin Percival <cperciva@freebsd.org>
Subject: Re: Time to bump default VM_SWZONE_SIZE_MAX?
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On Friday, August 24, 2012 5:44:48 am Dag-Erling Sm=C3=B8rgrav wrote:
> John Baldwin <jhb@freebsd.org> writes:
> > Hmm, this is not true on i386 where the problem is not just the physical
> > RAM required, but also address space.  (The swap zone is all mapped int=
o KVA=20
> > even if it isn't used.)  This is why Alan's e-mail specifically
> > mentioned amd64, ia64, etc. but not i386 in his list.  I think i386 sti=
ll
> > needs this limit, and I think your commit jumped the gun a bit.
>=20
> How about we reinstate the limit on i386, but increase it to 64 MB?
> That would increase the theoretical maximum to ~15 GB.  People with 8 GB
> swap would get a warning, but would be unlikely to run into trouble.
>=20
> (or we could increase the limit to 72351744 bytes, which is the precise
> amount required to support 16 GB)

Note that on i386 you can't get more than 4GB of RAM without PAE, and if you
have any modern x86 box with > 4GB of RAM, you are most likely running amd64
on it, not i386.  I think i386 would be fine to just keep the limit it had.

=2D-=20
John Baldwin