On Sun, 2007-07-29 at 09:39 +1000, Tim Allingham wrote: > On Sat, 2007-07-28 at 20:28 -0300, Daniel van Ham Colchete wrote: > > Hello everyone!!! > > > > May be somebody can shed some light here... I'm building a server here > > with 4GB of RAM memory. The fact is, if I boot with mem=3072M > > everything goes as fast as it should but I'm not using 1GB of memory. > > If I don't put the mem option, Linux will see 4GB of memory available > > but it will be damn slow (really). > > > > To make Linux recognize 4 gigs of memory I had to activate > > HIGHMEM=64GB, otherwise it only recognizes 3279MB (but it is fast). > > > > My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is > > Intel. I'm running Gentoo at 32bits mode and the kernel version is > > 2.6.20-gentoo-r8. > > > > Any lights would be very appreciated. > > > > Best regards, > > Daniel Colchete > > I don't actually run 4GB of RAM in any of my intel systems, so I can't > comment from experience, however my suspicion would be the overhead > introduced from PAE, which (at least on older kernels) requires some > processing overhead to utilise. Are you able to try a 64-bit install to > determine if this is the case? > > Regards, > > Tim Allingham > Email:[EMAIL PROTECTED]
just to add, this page gives a reasonable explanation of the problems with 32-bit OS's trying to address large RAM volumes http://www.dansdata.com/askdan00015.htm
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