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