From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: Spurious "NUMA placement failed, performance might be affected" message on ARM Date: Mon, 28 Apr 2014 13:15:29 +0100 Message-ID: <535E4661.70700@citrix.com> References: <1398422242.18537.411.camel@kazak.uk.xensource.com> <1398678915.6102.69.camel@Solace> <1398679293.29700.30.camel@kazak.uk.xensource.com> <1398684642.29700.71.camel@kazak.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1398684642.29700.71.camel@kazak.uk.xensource.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Ian Campbell Cc: Dario Faggioli , xen-devel List-Id: xen-devel@lists.xenproject.org On 28/04/14 12:30, Ian Campbell wrote: > On Mon, 2014-04-28 at 11:01 +0100, Ian Campbell wrote: > [...] >> total_memory : 8184 >> free_memory : 6933 > [...] >> node: memsize memfree distances >> 0: 4088 3861 20 > I think we are missing some RAM here... > > and I have now noticed that I only see this for guests which have more > RAM than this memfree value (+/- some slop). The guests succeed because > there is actually RAM available. > > I think this is enough for me to now track down the cause on the > hypervisor side. Thanks for your input. > > Ian. Do be aware that the memsize value is "number of pages on this node" which includes IO mappings of non-ram regions, and as a result memfree is mostly fictitious. I raised this as a concern with the hwloc code, but without any subsequent discussion. ~Andrew