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Re: [Xen-users] 32Bit domus and RAM between 128GB and 168 GB

  • To: xen-users@xxxxxxxxxxxxx
  • From: "Austin S. Hemmelgarn" <ahferroin7@xxxxxxxxx>
  • Date: Wed, 4 Jan 2017 13:00:34 -0500
  • Delivery-date: Wed, 04 Jan 2017 18:01:47 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

On 2017-01-04 09:50, Jan Marquardt wrote:

unfortunately we still have a lot of paravirtual guests with 32 Bit OS
and are currently running in some problems.

As far as I understand the documentation in xend-config.sxp, if a
physical machine has between 128 GB and 168 GB RAM, 32 Bit guests should
be able to consume up to 168 GB.

# 32-bit paravirtual domains can only consume physical
# memory below 168GB. On systems with memory beyond that address,
# they'll be confined to memory below 128GB.
# Using total_available_memory (in GB) to specify the amount of memory
# in the memory pool exclusively for 32-bit paravirtual domains.
# Additionally you should use dom0_mem = <-Value> as a parameter in
# xen kernel to reserve the memory for 32-bit paravirtual domains, default
# is "0" (0GB).

In our case we have four systems with 160 GB RAM, but the guests are not
able to start if there are already guests running which are consuming
128 GB RAM in sum.

Is this a bug or do we miss something?
168GB seems like a really odd number, and I'd be very inclined to believe that this is a typo in the documentation (that is, it should say 'physical memory below 128GB').

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