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

["Austin S. Hemmelgarn" <ahferroin7@xxxxxxxxx>]

On 2017-01-04 09:50, Jan Marquardt wrote:
> Hi,
>
> 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
> reserved
> # 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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