[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [RFC PATCH v2] spapr: Support ibm, dynamic-memory-v2 pr
|
From: |
Alexey Kardashevskiy |
|
Subject: |
Re: [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.
--
Alexey