From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: [Hackathon minutes] PV frontends/backends and NUMA machines Date: Tue, 21 May 2013 15:43:29 +0200 Message-ID: <1369143809.12423.85.camel@Solace> References: <20130521083251.GD9626@ocelot.phlegethon.org> <519B632902000078000D79C4@nat28.tlf.novell.com> <1369132208.12423.41.camel@Solace> <519B6BFE02000078000D7A5A@nat28.tlf.novell.com> <1369133894.12423.52.camel@Solace> <519B7ADF02000078000D7AF9@nat28.tlf.novell.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0657583615543777754==" Return-path: In-Reply-To: <519B7ADF02000078000D7AF9@nat28.tlf.novell.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: Jan Beulich Cc: George Dunlap , "xen-devel@lists.xensource.com" , Tim Deegan , Stefano Stabellini List-Id: xen-devel@lists.xenproject.org --===============0657583615543777754== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-16ZovA/QGRL8d60rNVCO" --=-16ZovA/QGRL8d60rNVCO Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On mar, 2013-05-21 at 12:47 +0100, Jan Beulich wrote: > >>> On 21.05.13 at 12:58, Dario Faggioli wrote: > > Well, sure, but then, again, how do you control which (and not only how > > much) memory is taken from which node? >=20 > Hmm, I may not have followed, but why is "which" important here at > all? The only (usual) restriction should apply regarding preservation of > memory below 4G. >=20 It is if you want Dom0 to think it is running, say, on 2 nodes and actually have the memory, say, in the range 0-1G accessed quicker from d0v0 (vcpu0 of Dom0), and the vice versa with memory within 1-2G and d0v1. That enables NUMA optimization _inside_ Dom0, like the pinning of the backends and all the other stuff discussed (during the Hackathon and) in this thread. However, to do that, we, I think, need to be able not only to specify that we want 1G worth of memory on one specific node, but also to request explicitly for some of Dom0's PFN to be here and for some others to be there, as we were saying earlier in the thread with Tim. Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-16ZovA/QGRL8d60rNVCO 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 v1.4.13 (GNU/Linux) iEYEABECAAYFAlGbegEACgkQk4XaBE3IOsQtRQCaA/8RDVaAgJggw503h7O2R4ab CpYAoKbdTcF0ydFF2tipDaHfWR9BRdbu =KGJO -----END PGP SIGNATURE----- --=-16ZovA/QGRL8d60rNVCO-- --===============0657583615543777754== 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 --===============0657583615543777754==--