Date: Thu, 18 Sep 2008 07:37:09 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Andrew Berry <andrewberry@sentex.net> Cc: questions@freebsd.org Subject: Re: Upgrading to 64 bit from a 32 bit installation on FBSD 7 Message-ID: <48D1F715.2070107@FreeBSD.org> In-Reply-To: <7D3E2F4C-5CF8-4DCA-8B8F-5AF2015250B1@sentex.net> References: <7D3E2F4C-5CF8-4DCA-8B8F-5AF2015250B1@sentex.net>
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Andrew Berry wrote: > Hi, > > I've got a server which will be upgraded to my "castoff" parts which > support amd64. This machine has been running Freebsd since the 5.0 RC's, > starting on a P2 233Mhz, upgraded incrementally for a few years - a real > testament to the stability of a FreeBSD install! What I've done in the > past while upgrading is simply move the drive, and rebuild everything > with an updated make.conf optimized for the new processor. Can I simply > rebuild the world (or use freebsd-update), and portupgrade everything to > rebuild for amd64? Or, will things break as libraries are upgraded which > still have 32-bit dependancies on the system? This is a pretty common question, did you try searching the archives or google for the answer? > Also, AFAIK upgrading to a 64 bit system allows access to additional > registers on the CPU, leading to a performance increase. The system will > only have 1.5 gigs of RAM, so that's not an issue, but are there any > benchmarks out there comparing performance on < 4GB hardware with 32 bit > and 64 bit Freebsd? Performance is not a single number. Sometimes 64-bit systems can be slower, sometimes faster. Run it on your own workload or look for a narrowly tailored benchmark and see what happens for you. Kris
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