From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:37122) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RscLS-0000bE-Bs for qemu-devel@nongnu.org; Wed, 01 Feb 2012 10:43:44 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RscLN-0003ls-Oq for qemu-devel@nongnu.org; Wed, 01 Feb 2012 10:43:38 -0500 Received: from moutng.kundenserver.de ([212.227.126.187]:52686) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RscLN-0003li-Gs for qemu-devel@nongnu.org; Wed, 01 Feb 2012 10:43:33 -0500 Date: Wed, 1 Feb 2012 16:43:28 +0100 (CET) From: Erik Rull Message-ID: <908703316.215593.1328111009018.JavaMail.open-xchange@email.1und1.de> In-Reply-To: <4F294F60.50006@siemens.com> References: <923364617.199626.1328100735285.JavaMail.open-xchange@email.1und1.de> <4F2940DD.5090807@redhat.com> <977314087.203900.1328104976777.JavaMail.open-xchange@email.1und1.de> <4F294F60.50006@siemens.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] git bisect results: ec757c67c40a56492001487e69272f62144fd124 breaks windows boot in qemu-kvm Reply-To: Erik Rull List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: "qemu-devel@nongnu.org" , "kvm@vger.kernel.org" , Avi Kivity On February 1, 2012 at 3:42 PM Jan Kiszka wrote: > On 2012-02-01 15:02, Erik Rull wrote: > > > > On February 1, 2012 at 2:40 PM Avi Kivity wrote: > > > >> On 02/01/2012 02:52 PM, Erik Rull wrote: > >>> Hi all, > >>> > >>> first of all I'm a bit confused: > >>> > >>> What is the difference between qemu with command line option > > --enable-kvm > >>> and qemu-kvm? > >>> It seems to be a difference in code so far, from the performance point > > of > >>> view it seems to be the same... > >> > >> The differences are being reduced rapidly, thanks to Jan's efforts. > >> Right now what remains is PIT performance and accuracy, device > >> assignment, and Windows XP performance. Most guests should see the same > >> performance. > > MSI performance is expected to be worse with upstream as well, thus virtio. > > >> > >>> Now my issue that lead me to a git bisect on qemu-kvm: > >>> The following commit / merge breaks my windows guest boot sequence and > >>> causes resets infinitely: > >>> ec757c67c40a56492001487e69272f62144fd124 Merge branch 'upstream-merge' > > into > >>> next > >>> Thu, 5 Jan 2012 11:00:07 +0000 (13:00 +0200) Avi Kivity > > > >>> > >>> > >>> Interesting: qemu with --enable-kvm master and the same command line > >>> options as qemu-kvm runs perfect. > >>> My command line options are: > >>> qemu-system-x86_64 -serial /dev/ttyS2 -readconfig > > /etc/ich9-ehci-uhci.cfg > >>> -device usb-host,bus=ehci.0 -device usb-tablet -drive > >>> file=/dev/sda2,cache=off -m 1024 -net nic,macaddr=$MACADDR -net > >>> tap,script=/etc/qemu-ifup -no-acpi -monitor stdio -L > > /usr/X11R6/share/qemu > >>> -boot c -localtime > >>> > >>> > >> > >> What version of Windows are you using? What's the contents of > >> /etc/ich9-ehci-uhci.cfg? > >> > > > > Hi Avi, > > > > the contents from the .cfg are located in docs/ich9-ehci-uhci.cfg > > > > I tried two versions of Windows XP: One is the default Windows XP SP3 that > > you get from MSDN, one is Windows Embedded Standard (embedded customized > > XP). > > > > Both show the same behavior: boots with qemu -enable-kvm and continuously > > reboots with qemu-kvm. > > What does qemu-kvm with -no-kvm-irqchip do? > > Jan > Wow - that works! Does this influence the guest performance?