Re: another pmem variant V2

From: Boaz Harrosh <boaz@plexistor.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-nvdimm@ml01.01.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	ross.zwisler@linux.intel.com, axboe@kernel.dk
Subject: Re: another pmem variant V2
Date: Tue, 31 Mar 2015 13:31:34 +0300	[thread overview]
Message-ID: <551A7786.3060908@plexistor.com> (raw)
In-Reply-To: <551A762A.7090307@plexistor.com>

On 03/31/2015 01:25 PM, Boaz Harrosh wrote:
> On 03/31/2015 12:25 PM, Christoph Hellwig wrote:
<>
> The problem I see is that if I state a memmap=nn!aa that crosses a NUMA
> boundary then the machine will not boot.
> So BTW for sure I need that "don't merge E820_PMEM ranges" patch because
> otherwise I will not be able to boot if I have pmem on both NUMA nodes
> and they happen to be contiguous.
> 

BTW if you need NUMA emulated in your KVM add the below to your virsh edit

  <cpu>
    ....
    <numa>
      <cell cpus='0-3' memory='5242880'/>
      <cell cpus='4-7' memory='3145728'/>
    </numa>
  </cpu>


memory= is in KiB only
The sum of these must exactly match what you have for 
  <memory unit='KiB'>8388608</memory>
  <currentMemory unit='KiB'>8388608</currentMemory>

And you probably already have say:
    <topology sockets='2' cores='4' threads='1'/>

Cheers
Boaz