On Sun, Dec 20, 2009 at 01:25:04PM +0100, Oliver Welter wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > Hi All, > anybody can tell me, if there are drawbacks/issues, running 32bit > systems on top of a 64bit host? there should be none as long as the personality is set properly and you have the 32bit compatibility enabled > I am currently running debian etch with a self compiled > 2.6.22-vs2.2.0.7 x86_64 on a 64bit Dual Athlon with 16GB of RAM. > At the moment I have 64bit guests (gentoo) running on it but > for some reasons* I am overthinking to downgrade the guests to > 32bit. > Main question is, whats about the 4GB Memory issue? > I assume each guest can address only 4GB of memory but will the > guest spread the 4 Gigs across the available address space? no, but it will be spread over the physical memory :) > *Reason: First, I have still several 32bit host nodes so it would > be simpler for me to maintain my guest images. Second: It seems > that especially php is eating memory on 64bit systems without > any earnings. usually 64bit code is more efficient on 64bit systems than 32bit code, and often the larger address space brings an advantage too ... of course, YMMV best, Herbert > best regards > Oliver > - -- > Protect your environment - close windows and adopt a penguin! > PGP-Key: 3B2C 8095 A7DF 8BB5 2CFF 8168 CAB7 B0DD 3985 1721 > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iEYEARECAAYFAksuF50ACgkQyrew3TmFFyEdEQCfZns8Pg/qTFYSycji+eaB+V2W > sxQAnisjgmSsUtefwpBpZ24P+FkuT6BG > =GHpd > -----END PGP SIGNATURE-----