hurd/running/debian/faq/512_mib_ram_limit: Split out. Written by Michael Banck.

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+[[meta copyright="Copyright © 2007 Free Software Foundation, Inc."]]
+[[meta license="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]]."]]
+
+# 512 MiB RAM Limit
+
+GNU Mach does not cope well with lots of memory.  Newer versions of the Debian
+`gnumach` package will limit themselves to around 1 GiB of memory.  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`.