From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: Luvalley-2 has been released: running KVM below any operating system Date: Sun, 19 Apr 2009 13:55:20 +0200 Message-ID: <49EB1128.9070801@web.de> References: <3b0605b30904151853n60075dc9g51a94f94613daca@mail.gmail.com> <706158FABBBA044BAD4FE898A02E4BC232872086@pdsmsx503.ccr.corp.intel.com> <3b0605b30904170154o4e0a559do34690b877c477972@mail.gmail.com> <49EB0EA2.6090206@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig3B99AB304167F7ACF5F668AA" Cc: Xiaodong Yi , "Zhang, Xiantao" , "kvm@vger.kernel.org" To: Avi Kivity Return-path: Received: from fmmailgate02.web.de ([217.72.192.227]:51948 "EHLO fmmailgate02.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756008AbZDSLz1 (ORCPT ); Sun, 19 Apr 2009 07:55:27 -0400 In-Reply-To: <49EB0EA2.6090206@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig3B99AB304167F7ACF5F668AA Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: quoted-printable Avi Kivity wrote: > Xiaodong Yi wrote: >> Hi, >> >> I've tested the guest Linux using UnixBench 5.1.2. The platform is: >> * Intel's Core Due CPU with 2 cores, 2GB RAM >> * CentOS 5.2 as the dom0 Linux, i.e., the host Linux for KVM >> * CentOS 5.2 as the guest Linux, i.e., the Linux running on the >> virtual machine provided by Qemu >> >> The first set of results is for Luvalley, and the second one is for >> KVM. As the result, Luvalley's guest Linux is 20% ~ 30% faster than >> KVM's guest! It is very surprise to me. I had through Luvalley's guest= >> should be the same performance as KVM's. >> >> =20 >=20 > Yes, it is surprising. >=20 >> Double-Precision Whetstone 12287.7 MWIPS (10.0 s, 2= samples) >> Double-Precision Whetstone 2166.3 MWIPS (10.2 s, 2= samples >=20 > That's by far the biggest difference. Can you confirm it isn't a typo? >=20 > If not, then it looks like we have a bug in floating point handling. I > don't think this benchmark uses sse. >=20 Even the native Linux numbers are not that high, rather comparable to KVM. I suspect Luvalley is fooling the benchmark here... Jan --------------enig3B99AB304167F7ACF5F668AA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iEYEARECAAYFAknrESgACgkQniDOoMHTA+lPnACfR27lQgPI2Gvk7UJ6rKZIXPR8 pe8Amwb9yEH2+oifeerLCLpW0ybE7Z9q =N8CO -----END PGP SIGNATURE----- --------------enig3B99AB304167F7ACF5F668AA--