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[[!meta copyright="Copyright © 2007, 2008, 2013 Free Software Foundation,
Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]
[[!tag faq/support]]
[[!meta title="830 MiB RAM Limit"]]
Just like any 32-bit OS without bad tricks, GNU Mach can not cope well with lots
of memory. Latest versions of the Debian `gnumach` package will limit themselves
to around 1.7 GiB of memory. If you want more, you can twiddle the `VM_MAX_ADDRESS`
limit between kernelland and userland in `i386/include/mach/i386/vm_param.h`.
If you have an older version, or still experience problems with `vmstat` (see
above) reported much less memory than you have, the best is to limit the memory
it can see via GRUB's `upppermem` feature. Add `uppermem 786432` to GRUB's Hurd
entry in `menu.lst`.
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