On February 1, 2012 at 3:42 PM Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: > On 2012-02-01 15:02, Erik Rull wrote: > > > > On February 1, 2012 at 2:40 PM Avi Kivity <avi@xxxxxxxxxx> 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 > > <avi@xxxxxxxxxx> > >>> > >>> > >>> 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? -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
