[Linuxppc-users] Total I/O Memeory Entitlement vs Online Memory?

[Will Schmidt]

"Linuxppc-users" <linuxppc-users-bounces
+willschm=us.ibm.com at lists.ozlabs.org> wrote on 11/12/2018 10:37:37 AM:

> From: "Stephen Lutz" <Stephen.Lutz at de.ibm.com>
> To: linuxppc-users at lists.ozlabs.org
> Date: 11/12/2018 11:05 AM
> Subject: [Linuxppc-users] Total I/O Memeory Entitlement vs Online Memory?
> Sent by: "Linuxppc-users" <linuxppc-users-bounces
> +willschm=us.ibm.com at lists.ozlabs.org>
>
> Hi all,
>
> I got a question from a customer, perhaps somebody can answer that:
>
> In a SLES Linux LPAR (for SAP HANA) with 4 TB the customer sees with
> the lparstat command:
>
> Online Memory : 4277701632 kB --> /1024 /1024 = ~4079 GB
>
> Total I/O Memory Entitlement: 4398046511104 /1024 /1024 /1024 = 4096 GB
>
> --> Difference ~17 GB
>
> The question is, why is there a difference? What are the 17 GB used
> for? As far as I understood, this is no Hypervisor memory, as this
> memory is inside the LPAR ...

Hi,

Per a glance at lparstat pages, looks like "Total I/O Memory Entitlement"
is the size of the pool, so likely no distinction between available and
used memory on that data point.

If you/they look at dmesg output, or /var/log/boot.msg , there will be a
line that reads "Memory: ###k/###k available ( ###k kernel code, ..."
Do the numbers associated with kernel, reserved,...  there make up the
difference?

thanks,
-Will

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