From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulrich Drepper Subject: Re: Paravirt KVM capabilities Date: Wed, 10 Jan 2007 10:00:59 -0800 Message-ID: <45A529DB.4030009@redhat.com> References: <20070109141916.GA13276@vlad.carfax.org.uk> <45A3A642.1030604@qumranet.com> <1168384852.19646.161.camel@localhost.localdomain> <20070110094750.GA934@elte.hu> <45A4BB74.9010102@redhat.com> <20070110101839.GA6444@elte.hu> <45A4C345.5050404@qumranet.com> <20070110105202.GA13412@elte.hu> <45A4C7ED.8090003@qumranet.com> <20070110111442.GA16867@elte.hu> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0578871151==" Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: To: Ingo Molnar In-Reply-To: <20070110111442.GA16867-X9Un+BFzKDI@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --===============0578871151== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigB96C2550810332D1FA21C276" This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigB96C2550810332D1FA21C276 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Ingo Molnar wrote: > that alone is already ~100-200 cycles overhead, it essentially doubles = > the null syscall overhead. It matters at millions of syscalls per secon= d=20 > workloads, 100 cycles overhead at 1 million syscalls a second means 5% = > performance difference at 2GHz. Plus, x86-64 uses only syscall which doesn't have the opportunity to be intercepted in ring 1, right? That's the much more important target going forward. --=20 =E2=9E=A7 Ulrich Drepper =E2=9E=A7 Red Hat, Inc. =E2=9E=A7 444 Castro St = =E2=9E=A7 Mountain View, CA =E2=9D=96 --------------enigB96C2550810332D1FA21C276 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFFpSnb2ijCOnn/RHQRAhoeAJ935Ps9x4xnrTfsUlMj+vwWQ+O4PwCfVYPL X5gAVUOA9HALwRDEWCmve/0= =98lL -----END PGP SIGNATURE----- --------------enigB96C2550810332D1FA21C276-- --===============0578871151== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV --===============0578871151== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ kvm-devel mailing list kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/kvm-devel --===============0578871151==--