Ubuntu RAM detection

Lennart Sorensen lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Mon Jul 14 19:51:58 UTC 2008


On Sun, Jul 13, 2008 at 04:57:14PM -0400, Tyler Aviss wrote:
> only find about 1GB when linux is booted up? Ubuntu 8/32-bit,
> self-rolled 2.6.25.9 kernel, on Dual-core Athlon 64. Various apps
> including "Top" etc only show about a gig of RAM. Not sure if this has
> something to do with running a 32-bit OS on 64-bit hardware (doubt it,
> I'm under the 4GB/CPU limit), something weird with the
> SMP/memory-sharing, (64-bit memory & IO resources not enabled in
> kernel), or some other issue?

If you run 32bit, then the kernel is limited to 900MB if no HIGHMEM
support is enabled.  4GB setting allows up to about 3.2GB, and 64GB
setting allows up to 62 or 63GB or so, while anymore than that requires
64bit kernel.

-- 
Len Sorensen
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