Messages in this thread |  | | | Subject | Re: AMD Athlon64 X2 Dual-core and 4GB | | From | (Eric W. Biederman) | | Date | Fri, 28 Oct 2005 10:13:46 -0600 |
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thockin@hockin.org writes:
> On Fri, Oct 28, 2005 at 09:30:51AM -0600, Eric W. Biederman wrote: >> > Thus, the question - would I be able to use whole 4G RAM with dual-core amd > and >> > kernel with SMP compiled for i686? > > Why would you use a dual core AMD in 32 bit mode? Just build an x86_64 > kernel. > > If you want to use 4GB in 32 bit mode, you *need* remapping (or you lose > part of your memory). Remapping means you have MORE than 4 GB of physical > address, which means you need PAE to use it at all.
Yes, and PAE works fine with a 32bit kernel. I agree it is a silly configuration and a 64bit kernel would use the memory more efficiently. My basic point was that a dual-core is a recent enough processor from AMD that it supports memory remapping. So with a correct BIOS there should be no problems.
Eric
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