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[Xen-devel] Last GB of memory?

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Christopher S. Aker" <caker@xxxxxxxxxxxx>
  • Date: Mon, 2 May 2005 14:20:16 -0500
  • Delivery-date: Mon, 02 May 2005 19:14:00 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>


Can anyone provide me an explanation as to why Xen refuses to access the last 
GB of
RAM as of late?  This machine has 6GB of memory, which I expect a little under 
4GB to
be available to Xen for domains, however it's only allowing 3GB.  Same thing
with -testing and -unstable.

 Xen version 3.0-devel (root@xxxxxxxxxx) (gcc version 3.4.3 20041212 (Red Hat
3.4.3-9.EL4)) Mon May  2 13:18:41 EDT 2005
 Latest ChangeSet: 2005/05/02 17:07:35 1.1416 42765047QI9d01CBiVyH-bBFAhM6lQ

(XEN) WARNING: Only the first 4GB of the physical memory map can be accessed
(XEN)          by Xen in 32-bit mode. Truncating the memory map...
(XEN) Physical RAM map:
(XEN)  0000000000000000 - 000000000009b800 (usable)
(XEN)  000000000009b800 - 00000000000a0000 (reserved)
(XEN)  00000000000e4000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000bff70000 (usable)
(XEN)  00000000bff70000 - 00000000bff78000 (ACPI data)
(XEN)  00000000bff78000 - 00000000bff80000 (ACPI NVS)
(XEN)  00000000bff80000 - 00000000c0000000 (reserved)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec10000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ff800000 - 00000000ffc00000 (reserved)
(XEN)  00000000fffffc00 - 0000000100000000 (reserved)
(XEN) System RAM: 3071MB (3144748kB) <---- *???*
(XEN) Xen heap: 10MB (10704kB)

# xm info
memory                 : 3071  <---- *???*

I don't recall it doing this until recently.   Is this a fact of life until 
PAE, or
is this a bug relating to the fixes for the domain.c BUG I reported earlier 
that Keir


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