-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 08/04/07 14:31, Andrew J. Barr wrote: > On 8/4/07, Ron Johnson <[EMAIL PROTECTED]> wrote: >> On 08/04/07 12:53, Andrew J. Barr wrote: >>>> a) What are the pros and cons in switching to 64 bit mode? >>>> - Is it faster? >>> Yes. Unlike true 64-bit architectures like PowerPC, there is a penalty >>> for executing 32 bit code on amd64/em64t processors. >> Penalty? Absolutely fscking not!!!! The A64 processes 32 bit code >> at a similar speed to "regular" Athlon CPUs. > > Do you have any sources for this? I remember quite distinctly seeing > on a mailing list, I think it was debian-powerpc in fact, that the > only reason that AMD64 operating systems have an all-64-bit user land > is because there is a penalty for executing 32-bit code, one which is > not present on other true 64-bit architectures. 64-bit code /does/ use > more memory, so it is advantageous to have a mixed userland if you can > afford it--e.g. only compiling applications that will benefit from > 64-bit into 64-bit executables. This is what the OSes for other 64-bit > architectures do. > > Perhaps the penalty is only under a 64-bit kernel...
I think we might have different definitions of "penalty". What I mean is that an AMD64 in 32-bit mode will run apps at the same speed as an equivalently-clocked AthlonXP. - -- Ron Johnson, Jr. Jefferson LA USA Give a man a fish, and he eats for a day. Hit him with a fish, and he goes away for good! -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFGtOHMS9HxQb37XmcRAqLbAJ9ur/EB+r+tgzww7WKBgqEKlz9CAgCfbtzS 64Neda8mpS38KGhTgZn8Rk4= =xQoK -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
