From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:53427) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TCSkp-0008CV-C9 for qemu-devel@nongnu.org; Fri, 14 Sep 2012 06:04:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TCSkj-0000uP-M2 for qemu-devel@nongnu.org; Fri, 14 Sep 2012 06:04:07 -0400 Received: from isrv.corpit.ru ([86.62.121.231]:56681) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TCSkj-0000uH-E0 for qemu-devel@nongnu.org; Fri, 14 Sep 2012 06:04:01 -0400 Message-ID: <5053010E.1000103@msgid.tls.msk.ru> Date: Fri, 14 Sep 2012 14:03:58 +0400 From: Michael Tokarev MIME-Version: 1.0 References: <5052DF3A.1070007@msgid.tls.msk.ru> <20120914093304.GC6819@redhat.com> <5052FB60.3060109@msgid.tls.msk.ru> <50530047.9030703@siemens.com> In-Reply-To: <50530047.9030703@siemens.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: qemu-devel On 14.09.2012 14:00, Jan Kiszka wrote: [] > The major difference in qemu-system-i386 vs. qemu-system-x86_64 is on > the TCG side: We measured noticeable performance benefits when running > 32/16 bit OSes against qemu-system-i386 vs. using qemu-system-x86_64. I > don't have numbers at hand, but colleagues decided to use the 32-bit > version for that reason (when no KVM is available). Interesting. Maybe someone should look at the difference on TCG side and merge interesting bits from i386 to x86_64... :) The thing is: x86_64 becomes the only x86 platform these days, or at least the MAIN platform. Thank you for the clarification -- very useful information indeed! /mjt