From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? Date: Wed, 04 Aug 2010 14:36:52 +0300 Message-ID: <4C5950D4.90300@redhat.com> References: <4C5858B2.9090801@redhat.com> <4C585F5B.5070502@codemonkey.ws> <4C58635B.7020407@redhat.com> <20100803190525.GB16570@redhat.com> <4C586AB9.5040302@codemonkey.ws> <4C586CF9.7030206@redhat.com> <20100803220628.GC28523@amd.home.annexia.org> <4C59009B.1050500@redhat.com> <20100804092428.GD28523@amd.home.annexia.org> <4C593857.9040602@redhat.com> <20100804113318.GE28523@amd.home.annexia.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Anthony Liguori , Gleb Natapov , qemu-devel@nongnu.org, kvm@vger.kernel.org To: "Richard W.M. Jones" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:44996 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932673Ab0HDLhB (ORCPT ); Wed, 4 Aug 2010 07:37:01 -0400 In-Reply-To: <20100804113318.GE28523@amd.home.annexia.org> Sender: kvm-owner@vger.kernel.org List-ID: On 08/04/2010 02:33 PM, Richard W.M. Jones wrote: > > I'm only allocating 500MB of RAM, so there's easily enough space to > put a large ROM, with tons of room for growth (of both RAM and ROM). > Yes, even real hardware has done this. The Weitek math copro mapped > itself in at physical memory addresses c0000000 (a 32 MB window IIRC). I'm sure it will work for your use case, but it becomes a feature that only works if you have a guest with a small amount of memory and few pci devices. With a larger guest it fails. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.