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From: Michal Privoznik <mprivozn@redhat.com>
Message-ID: <ae0335fb-9201-e09d-80ad-5e497365267b@redhat.com>
Date: Mon, 4 Mar 2019 17:12:40 +0100
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Subject: Re: [Qemu-devel] [libvirt] [PATCH 1/2] numa: deprecate 'mem'
 parameter of '-numa node' option
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To: Igor Mammedov <imammedo@redhat.com>, =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= <berrange@redhat.com>
Cc: peter.maydell@linaro.org, ehabkost@redhat.com, libvir-list@redhat.com, qemu-devel@nongnu.org, Markus Armbruster <armbru@redhat.com>, qemu-arm@nongnu.org, qemu-ppc@nongnu.org, pbonzini@redhat.com, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, david@gibson.dropbear.id.au

On 3/4/19 4:19 PM, Igor Mammedov wrote:

> Then I'd guess that most VMs end up with default '-numa node,mem'
> which by design can produce only fake NUMA without ability to manage
> guest RAM on host side. So such VMs aren't getting performance benefits
> or worse run with performance regression (due to wrong sched/mm decisions
> as guest kernel assumes NUMA topology is valid one).

Specifying NUMA distances in libvirt XML makes it generate the modern 
cmd line.

Michal