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Re: [Qemu-ppc] [Qemu-devel] [RFC PATCH v2] spapr: Support ibm, dynamic-m

From: Alexey Kardashevskiy
Subject: Re: [Qemu-ppc] [Qemu-devel] [RFC PATCH v2] spapr: Support ibm, dynamic-memory-v2 property
Date: Wed, 11 Apr 2018 13:56:14 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0

On 10/4/18 1:02 pm, David Gibson wrote:
> On Mon, Apr 09, 2018 at 11:55:38AM +0530, Bharata B Rao wrote:
>> The new property ibm,dynamic-memory-v2 allows memory to be represented
>> in a more compact manner in device tree.
> I still need to look at this in more detail, but to start with:
> what's the rationale for this new format?
> It's more compact, but why do we care?  The embedded people always
> whinge about the size of the deivce tree, but I didn't think that was
> really a concern with PAPR.

Well, booting a guest with 500 pci devices (let's say emulated e1000 or
virtio-net) creates >20sec delay in the guest while it is fetching the
device tree in early setup, property by property, I even have a patch for
pseries guest to get FDT as a whole blob from SLOF. It is not The Problem
but still annoying.


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