linux-kernel - RE: [Linux-nvdimm] [PATCH 1/6] SQUASHME: Don't let e820

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Date:	Tue, 31 Mar 2015 17:16:53 +0000
From:	"Brooks, Adam J" <adam.j.brooks@...el.com>
To:	Boaz Harrosh <boaz@...xistor.com>, Christoph Hellwig <hch@....de>
CC:	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: RE: [Linux-nvdimm] [PATCH 1/6] SQUASHME: Don't let e820_PMEM
 sections

>If we need a NUMA crossing a mids a contiguous memory range
>we split the range at NUMA boundary so to produce two pmemX
>devices. We do not like 2 NUMA IDs at the same device.
>
>TODO: What happens with real type-12 NvDIMM the BIOS splits
>these ranges?

The physical memory map for an Intel based dual socket system supporting NVDIMMS will be:
Socket 0 Normal Memory
Socket 0 NVDIMMs
Socket 1 Normal Memory
Socket 1 NVDIMMs

If you have both NVDIMMs and normal DIMMs on both sockets you will see two separate ranges. If there are NVDIMMs on both sockets, but no normal memory on socket 1, then you will end up with a single range covering the NVDIMMs on both sockets.
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