From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: nested KVM slower than QEMU with gnumach guest kernel Date: Mon, 17 Nov 2014 10:04:37 +0100 Message-ID: <5469BA25.2090204@web.de> References: <20141111185515.GA16376@type.youpi.perso.aquilenet.fr> <54629EFC.1050307@web.de> <20141116221828.GA13123@type> <20141117085845.GE26187@minantech.com> <20141117090342.GP3110@type.youpi.perso.aquilenet.fr> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="tjiruuOcO0GnlJjdkWLH6rBlN4s3AGw7a" To: Samuel Thibault , Gleb Natapov , kvm@vger.kernel.org, pbonzini@redhat.com Return-path: Received: from mout.web.de ([212.227.15.4]:59593 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751630AbaKQJEo (ORCPT ); Mon, 17 Nov 2014 04:04:44 -0500 In-Reply-To: <20141117090342.GP3110@type.youpi.perso.aquilenet.fr> Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --tjiruuOcO0GnlJjdkWLH6rBlN4s3AGw7a Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 2014-11-17 10:03, Samuel Thibault wrote: > Gleb Natapov, le Mon 17 Nov 2014 10:58:45 +0200, a =E9crit : >> Do you know how gnumach timekeeping works? Does it have a timer that f= ires each 1ms? >> Which clock device is it using? >=20 > It uses the PIT every 10ms, in square mode > (PIT_C0|PIT_SQUAREMODE|PIT_READMODE =3D 0x36). Wow... how retro. That feature might be unsupported - does user space irqchip work better? Jan --tjiruuOcO0GnlJjdkWLH6rBlN4s3AGw7a Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEARECAAYFAlRpuiUACgkQitSsb3rl5xQ0HwCcCTRh6m/ond/hd0IsFzAIsdJ5 zQIAn2pOJr5PjlaGXCt/re5PuiexO5BK =L0wN -----END PGP SIGNATURE----- --tjiruuOcO0GnlJjdkWLH6rBlN4s3AGw7a--