From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anthony Liguori <anthony@codemonkey.ws>
Subject: Re: [PATCH 0/3] KVM-userspace: add NUMA support for guests
Date: Mon, 01 Dec 2008 09:34:43 -0600
Message-ID: <49340413.9090003@codemonkey.ws>
References: <492F1DD9.8030901@amd.com> <49318A10.7080801@redhat.com> <4933F177.5040802@amd.com> <4933F4B0.7040500@redhat.com> <4934027D.8080904@codemonkey.ws>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: Andre Przywara <andre.przywara@amd.com>, kvm@vger.kernel.org,
	"Daniel P. Berrange" <berrange@redhat.com>, Andi Kleen <ak@suse.de>
To: Avi Kivity <avi@redhat.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from an-out-0708.google.com ([209.85.132.240]:34886 "EHLO
	an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751693AbYLAPeu (ORCPT <rfc822;kvm@vger.kernel.org>);
	Mon, 1 Dec 2008 10:34:50 -0500
Received: by an-out-0708.google.com with SMTP id d40so917094and.1
        for <kvm@vger.kernel.org>; Mon, 01 Dec 2008 07:34:49 -0800 (PST)
In-Reply-To: <4934027D.8080904@codemonkey.ws>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

Anthony Liguori wrote:
>
> numactl  --offset=0G  --length=1G --membind=0 --file /dev/shm/A --touch
> numactl  --offset=1G  --length=1G --membind=1 --file /dev/shm/A --touch
>
> And then create the VM with:
>
> qemu-system-x86_64 -mem-path /dev/shm/A -mem 2G ...
>
> What's best about this approach, is that you get full access to what 
> numactl is capable of.  Interleaving, rebalancing, etc.

Prefaulting, generating an error when NUMA placement can't be 
satisified, hugetlbfs support, yeah, this very much seems like the right 
thing to do to me.

If you care enough about performance to do NUMA placement, you almost 
certainly are going to be doing hugetlbfs anyway so you get it 
practically for free.

Regards,

Anthony Liguori

> Regards,
>
> Anthony Liguori