From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: Spurious "NUMA placement failed, performance might be affected" message on ARM Date: Tue, 29 Apr 2014 17:36:19 +0200 Message-ID: <1398785779.16933.23.camel@Solace> 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> <535E4661.70700@citrix.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2382161827589375467==" Return-path: In-Reply-To: <535E4661.70700@citrix.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: Andrew Cooper Cc: Ian Campbell , xen-devel List-Id: xen-devel@lists.xenproject.org --===============2382161827589375467== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-rGyUcKyHMOSj+rGa+d+g" --=-rGyUcKyHMOSj+rGa+d+g Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On lun, 2014-04-28 at 13:15 +0100, Andrew Cooper wrote: > 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. >=20 > 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. >=20 > I raised this as a concern with the hwloc code, but without any > subsequent discussion. >=20 There has been another discussion about discrepancies in total and free memory reporting. ISTR, it was noticed at the time when I added the support for some of these NUMA stuff in libvirt. I don't have it handy right now... I'll see if I can fetch it back, merge it with your observations in the hwloc thread and (re)start a discussion about this. Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-rGyUcKyHMOSj+rGa+d+g Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEABECAAYFAlNfxvMACgkQk4XaBE3IOsQqXQCgjd7rCNaSOzSDUT8W9wBk/yi3 HOYAoI8JGNC5fr1Y0aSnrzc3ZHs78Vb0 =yIVI -----END PGP SIGNATURE----- --=-rGyUcKyHMOSj+rGa+d+g-- --===============2382161827589375467== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============2382161827589375467==--