Date: Sat, 9 Oct 2010 09:45:11 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-amd64@freebsd.org Subject: Re: linux32 sysctl limits? Message-ID: <20101009064511.GV2392@deviant.kiev.zoral.com.ua> In-Reply-To: <20101008231210.GA90183@troutmask.apl.washington.edu> References: <20101008221701.GA89977@troutmask.apl.washington.edu> <20101008222013.GT2392@deviant.kiev.zoral.com.ua> <20101008231210.GA90183@troutmask.apl.washington.edu>
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--DXai+D0O/pduKrS9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Oct 08, 2010 at 04:12:10PM -0700, Steve Kargl wrote: > On Sat, Oct 09, 2010 at 01:20:13AM +0300, Kostik Belousov wrote: > > On Fri, Oct 08, 2010 at 03:17:01PM -0700, Steve Kargl wrote: > > > 'man linux' does not list or describe the following sysctl > > > variables. > > >=20 > > > compat.linux32.maxvmem: 0 > > > compat.linux32.maxssiz: 67108864 > > > compat.linux32.maxdsiz: 536870912 > > >=20 > > > Are there any limitations with setting these to > > > say 1G for stack and 4G for data on a system with > > > 16G of memory? > >=20 > > The linux ABI processes are 32bit, so you cannot reallistically assign > > 4Gb to maxdsiz. The space between data (bss) end and stack bottom is > > used for mappings, so it should be kept large enough. >=20 > Does this mean that maxssiz+maxdsiz=3D3G would allow=20 > 1G for mappings? The only linux app that will be > running is matlab (and I suppose any children processes > of matlab). It has a chance of working. I do not know how much is linux userland sensitive to the address space layout change. --DXai+D0O/pduKrS9 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAkywD3cACgkQC3+MBN1Mb4iZlACgvAQNK4wRChMtYz6cTGbsOU8W MusAoKujmZjuwYG0p5AhnZs//NA9F8c1 =ECRR -----END PGP SIGNATURE----- --DXai+D0O/pduKrS9--
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