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[Xen-devel] xen does not see more than 173800500k of memory

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Subject: [Xen-devel] xen does not see more than 173800500k of memory
From: "Krysan, Susan" <KRYSANS@xxxxxxxxxx>
Date: Wed, 22 Aug 2007 17:33:37 -0500
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Thread-topic: xen does not see more than 173800500k of memory

Our test server (Unisys ES7000) has recently been upgraded with more processors and more memory, so I am testing x86_64 xen with 64 cpus and 192gb.  I compiled xen with max_phys_cpus=64 and debug=y.  xen sees the 64 cpus, but only sees 173800500k of the 192gb.  I booted dom0 with 2048M and numa=on.  I get the same result when I configure the server to have 176gb (xen still sees only 173800500k). Booting without numa=on makes no difference.


xentop - 14:48:42   Xen 3.0-unstable

1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown

Mem: 173800500k total, 4324748k used, 169475752k free    CPUs: 64 @ 3400MHz

      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS


  Domain-0 -----r         95    0.0    2097152    1.2   no limit       n/a    32

    0        0        0    0        0        0        0    0


When I configure the server with 160gb or less, xen sees all of the memory.


Also, when I boot with the SLES kernel, SLES can see the all of the memory.


I assume there is not a memory limit on xen.  I would greatly appreciate any help to resolve this problem.



Sue Krysan

Linux Systems Group

Unisys Corporation



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