[Xen-users] Accessing new extra memory

[Steven Timm <timm@xxxxxxxx>]

Hi--I am currently running i386 version of xen 3.0.2
[root@fermigrid0 ~]# uname -a
Linux fermigrid0.fnal.gov 2.6.16-xen3_86.1_rhel4.1 #1 SMP Thu Apr 13 
06:52:14 PDT 2006 i686 i686 i386 GNU/Linux
The machine previously had 4GB of RAM, and was booted
with option dom0_mem=1024000 to ensure at least 1GB of RAM in
dom0. I am also running five Xen instances using 500MB of RAM apiece.

Today I upgraded the RAM to 12GB.  I attempted to leave dom0 at 1GB
and increase each of the Xen instances to 1GB for starters.
What actually happened is by the time I tried to start the
third 1GB instance I ran out of memory, it said there were only
168MB available.

Is there something in this kernel that limits us to only 4GB of RAM?
If so, what is the way around it? I can upgrade if necessary.
(For that matter even before this, the sum of dom0 plus the 5 xen 
instances didn't add up to the total amount of memory in the machine.)
[root@fermigrid0 ~]# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      538     4 r-----  2694.1
fermigrid0-xen1                    5      500     2 -b----  1107.0
fermigrid0-xen2                    6      500     2 -b----    41.2
fermigrid0-xen3                    7      500     2 -b----    86.2
fermigrid0-xen4                    8      500     2 -b----    41.3
fermigrid0-xen5                    9      500     2 r-----    42.1



Steve



--
------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group Leader.

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