From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerd Hoffmann Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? Date: Tue, 03 Aug 2010 23:24:23 +0200 Message-ID: <4C588907.1080400@redhat.com> References: <20100803162857.GX13789@amd.home.annexia.org> <4C584781.9040609@redhat.com> <4C5847CD.9080107@codemonkey.ws> <4C5848C7.3090806@redhat.com> <4C584982.5000108@codemonkey.ws> <4C584B66.5070404@redhat.com> <4C5854F1.3000905@codemonkey.ws> <4C5858B2.9090801@redhat.com> <4C585F5B.5070502@codemonkey.ws> <4C58635B.7020407@redhat.com> <20100803190525.GB16570@redhat.com> <4C586AB9.5040302@codemonkey.ws> <4C586CF9.7030206@redhat.com> <4C58702D.10406@codemonkey.ws> <4C5870FF.1050206@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Anthony Liguori , Gleb Natapov , "Richard W.M. Jones" , qemu-devel@nongnu.org, kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from mx1.redhat.com ([209.132.183.28]:8629 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756153Ab0HCVYm (ORCPT ); Tue, 3 Aug 2010 17:24:42 -0400 In-Reply-To: <4C5870FF.1050206@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Hi, > Again I don't follow. We can just lay out the ROMs in memory like we did > in the past? Well. We have some size issues then. PCI ROMS are loaded by the BIOS in a way that only a small fraction is actually resident in the small 0xd0000 -> 0xe0000 area. That doesn't work if qemu tries to simply copy the whole thing there like old versions did. With the size of the gPXE roms this matters in real life. cheers, Gerd From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=44458 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OgOyg-0002CZ-8U for qemu-devel@nongnu.org; Tue, 03 Aug 2010 17:24:58 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OgOyY-0000Ck-Ol for qemu-devel@nongnu.org; Tue, 03 Aug 2010 17:24:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37386) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OgOyY-0000CY-Gk for qemu-devel@nongnu.org; Tue, 03 Aug 2010 17:24:42 -0400 Message-ID: <4C588907.1080400@redhat.com> Date: Tue, 03 Aug 2010 23:24:23 +0200 From: Gerd Hoffmann MIME-Version: 1.0 Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? References: <20100803162857.GX13789@amd.home.annexia.org> <4C584781.9040609@redhat.com> <4C5847CD.9080107@codemonkey.ws> <4C5848C7.3090806@redhat.com> <4C584982.5000108@codemonkey.ws> <4C584B66.5070404@redhat.com> <4C5854F1.3000905@codemonkey.ws> <4C5858B2.9090801@redhat.com> <4C585F5B.5070502@codemonkey.ws> <4C58635B.7020407@redhat.com> <20100803190525.GB16570@redhat.com> <4C586AB9.5040302@codemonkey.ws> <4C586CF9.7030206@redhat.com> <4C58702D.10406@codemonkey.ws> <4C5870FF.1050206@redhat.com> In-Reply-To: <4C5870FF.1050206@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Gleb Natapov , "Richard W.M. Jones" Hi, > Again I don't follow. We can just lay out the ROMs in memory like we did > in the past? Well. We have some size issues then. PCI ROMS are loaded by the BIOS in a way that only a small fraction is actually resident in the small 0xd0000 -> 0xe0000 area. That doesn't work if qemu tries to simply copy the whole thing there like old versions did. With the size of the gPXE roms this matters in real life. cheers, Gerd