Messages in this thread | | | Date | Mon, 14 May 2001 21:57:20 -0400 | From | Brian Gerst <> | Subject | Re: 2.4.4 kernel reports wrong amount of physical memory |
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"H. Peter Anvin" wrote: > > Followup to: <Pine.LNX.4.33.0105142025000.18102-100000@duckman.distro.conectiva> > By author: Rik van Riel <riel@conectiva.com.br> > In newsgroup: linux.dev.kernel > > > > On Mon, 14 May 2001, Wayne Whitney wrote: > > > In mailing-lists.linux-kernel, you wrote: > > > > > > > You need to compile highmem support into the kernel if you want to > > > > use more than 890 MB of RAM, set it to maximum 4GB for best > > > > performance... > > > > > > On a similar note, what is the maximum physical memory supported > > > by the 4GB option? > > > > Ummm, 4GB maybe? ;) > > > > It seems obvious once you know why the limits are there. The 1 GB > limit (actually 1024-128 MB = 896 MB) is a software limit; the 4 GB > and 64 GB limits are hardware limits and are exact.
Even with the 4GB and 64GB options, some physical address space has to be reserved for memory mapped I/O.
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