Date: Mon, 26 Nov 2007 16:03:45 +0100 From: Gergely CZUCZY <phoemix@harmless.hu> To: Guy Helmer <ghelmer@palisadesys.com> Cc: freebsd-stable@freebsd.org Subject: Re: mmap max size (qemu VM memsize limit) Message-ID: <20071126150345.GA7560@harmless.hu> In-Reply-To: <474ADF40.5050500@palisadesys.com> References: <20071121142404.GA7511@harmless.hu> <474ADF40.5050500@palisadesys.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--k+w/mQv8wyuph6w0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Nov 26, 2007 at 08:59:12AM -0600, Guy Helmer wrote: > Gergely CZUCZY wrote: > >Hello, > > > >I'm trying to set up a qemu with 4G memory to the host system > >on a 7-BETA2, and I've hit some kind of limit in freebsd. > > > >When i give more then ~2000MB of memory to qemu, it returns > >an after trying to mmap() it, saying "Could not map physical memory". > > > >At the end of mmap(2) there's a note saying: > >" The len argument is limited to the maximum file size or available = user- > > land address space. Files may not be able to be made more than 1TB= large > > on 32 bit systems due to file systems restrictions and bugs, but ad= dress > > space is far more restrictive. Larger files may be possible on 64 = bit > > systems." > > > >I guess I've found this limit. I've tried to check a few sysctls but I w= asn't > >able to find the one effecting this limit. > > > >Could someone point me into the right direction in increasing the maximum > >mmap-able size? > > > > =20 > If you are using the 32-bit i386 system, then you could be limited by a c= ouple of things, the kern.maxdsiz loader tunable or the datasize limit are= =20 > likely. On i386, I believe 1073741824 (1G) is the default maxdsiz. With= 4GB of RAM, I think you ought to be able to double kern.maxdsiz in=20 > /boot/loader.conf. It's an amd64 with 14Gs of RAM in it. Sorry for accidentally omitting this. Sincerely, Gergely Czuczy mailto: gergely.czuczy@harmless.hu --=20 Weenies test. Geniuses solve problems that arise. --k+w/mQv8wyuph6w0 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) owFVVb9vI0UUDjlxxUoUByVCegpIuYB3s3Yc2zH4ckk4TBABwQVFHDSzu7P2KLsz e/MjuU2BKCko4BDVCf4DJAr4C6BGCHG6Ni0FQhQ0VLw3a2+EpTjW7Hvf+973vjf7 xTPXVlZv/PL9Dx+98vnDR099d/2b5OXSWStnYcn0mZBhN4674XB7EIejcJvl6TAb 9XqjbGfAs53pW5fvHShpubThcV3xMVj+wG5WBRPyVUjnTBtuJ87m4ShYxr0uTKWM sELJMQhZCMnbZ8eaSZNzHd6RqcqEnI3hvlOWZ2GlhbQsKXgQvCvhSMkOvKPOoDfo QC+Oh8AsxKPx9s6429s7gjAexHEHpq6GN3lRcg3nGmHGwS2Ycj3jRQ0H9z44uPfh 1fktDCxUh37R3+F6CVbXSAGsAuwCXAUM7vPSwbmwc+hPoeSl0jU9t3MOc2UsmNpY XhKAkhg+DPfvHO/1OsBkBofrZxglMEiVHE4FHqkcClHikZCQa84Tk0VLBidzLkHA TGAW1uFURMIn2G18tE+ZV+WJVQcQRnPrtDSUzrB+brHzqy7KklU3NzCuA4b5w7UD 5YoMpLKAz6Ca10akrFhAr7Vc9qxvkTeUPU5vg440XzfYJwLwBabXcg3oc4wpBXJm euZKHC8I07TLs6VoJXsgSldCLgoEEBcclAZ2xkRBs4ZJ4Ay6gSA9YkE6sizT3Bgw FUt5BPAG5hpEqn0fCQefigUSws9a9VCR7vH+JEAUtECLiYPa6kEilsMzkDmf3nBa nGFFq0VKrjV+mombmQ5+W+QzCTyjFtIzo25zppvqbfoZMX6bCGhfoCGOTHEnjCDi yGfQx86R0RVgwyJaa+0JM0caeE/lyiEhO1/KGzXHWLAROp3z9BSnlPNzQkptYTzx QzifBMzIdV9oqVouPBgRwYnnOUfW5J8r+CWJxjzkZgqtFG4oOge9vBiuFrO5hUxo 7nUjkwuZas5MA9iOn8DIVKHnQDbYXdaASS/G/4c51Mqhkzi4NnurF9LYxNZosFCo 0ywJhaaeHAq7dFxSowTpJFCuIpVz6kjSDAnqlGsZIZsMi0Oh0DW4OE56PuhICsmY Zd6hzcYilUnQkCvEKd4oOFe8mYhMB5VNeCE4DqEbD7eG/e6o14eb3ekGmcKD8Zy5 grbOl8TcE7xU0Jv9qd/t9/eOCIUonvp2lCMtG1MvJ5UpR7/+x13IhtNmopTdbDqJ UiXzKDi0tKu4jmWGBvOXWLc/NYtyfjponbtK46WS0xqmqchwbVmB16XCnlsfREFw FyeJ21/UnSBor9QLl17UQYnba9UYZs1xlPrj2/gyKNHvJpq7IAhDonnCuRS4Aha3 I8KbWQpcd1xsVaBylVbYXUl6MZJbGB4Fn+1ee3qF3jrLN9aN1Z+erHz70pPqtxeD 5y7//vWrrz/dffzCX5dwsvLo+sPV17I/f//xH5F8+fj5Z/+9/fPHf/wH =k6+t -----END PGP SIGNATURE----- --k+w/mQv8wyuph6w0--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20071126150345.GA7560>