From owner-freebsd-emulation@FreeBSD.ORG Wed Nov 28 16:05:36 2012 Return-Path: Delivered-To: freebsd-emulation@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 2CF0B69E; Wed, 28 Nov 2012 16:05:36 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) by mx1.freebsd.org (Postfix) with ESMTP id 82DAE8FC0C; Wed, 28 Nov 2012 16:05:35 +0000 (UTC) Received: from tom.home (localhost [127.0.0.1]) by kib.kiev.ua (8.14.5/8.14.5) with ESMTP id qASG5Oxc041267; Wed, 28 Nov 2012 18:05:24 +0200 (EET) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.7.1 kib.kiev.ua qASG5Oxc041267 Received: (from kostik@localhost) by tom.home (8.14.5/8.14.5/Submit) id qASG5O4u041266; Wed, 28 Nov 2012 18:05:24 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Wed, 28 Nov 2012 18:05:24 +0200 From: Konstantin Belousov To: Andriy Gapon Subject: Re: VirtualBox 4.2.4 on FreeBSD 9.1-PRERELEASE problem: VMs behave very different when pinned to different cores Message-ID: <20121128160524.GT3013@kib.kiev.ua> References: <50AFAD05.1050604@FreeBSD.org> <50B25C17.20208@FreeBSD.org> <50B62CB3.70101@FreeBSD.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="jllsgs4PL/sXFNaa" Content-Disposition: inline In-Reply-To: <50B62CB3.70101@FreeBSD.org> User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on tom.home Cc: "freebsd-emulation@freebsd.org" , Alexander Motin X-BeenThere: freebsd-emulation@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Development of Emulators of other operating systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Nov 2012 16:05:36 -0000 --jllsgs4PL/sXFNaa Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Nov 28, 2012 at 05:24:35PM +0200, Andriy Gapon wrote: > on 26/11/2012 09:10 Alex Chistyakov said the following: > > CPU: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz (3200.18-MHz K8-class CPU) > > Origin =3D "GenuineIntel" Id =3D 0x206d7 Family =3D 0x6 Model =3D = 0x2d > > Stepping =3D 7 > > Features=3D0xbfebfbff > > Features2=3D0x1fbee3bf > > AMD Features=3D0x2c100800 > > AMD Features2=3D0x1 > > TSC: P-state invariant, performance statistics > >=20 >=20 > Is this a multi-socket system? >=20 > It would be very strange that a modern CPU like this would have such a sk= ew > between TSC on different cores. >=20 > On my Core i5-3570 I see that the _observed_ skew is no more than 100 tic= ks (after > many days of uptime). It could be zero, in fact, given the inaccuracy of > inter-core measurements. I believe that Cores have single TSC per package, located in uncore. And Core i7 cannot work in multi-socket systems. --jllsgs4PL/sXFNaa Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlC2NkQACgkQC3+MBN1Mb4j4HgCcCR/OAp5jigpvyQmFi+QjfCMM Pw0AoLY8s09L4G8yqQpwC4SGkhoUNEjm =IfVF -----END PGP SIGNATURE----- --jllsgs4PL/sXFNaa--