On February 1, 2012 at 5:01 PM Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: > On 2012-02-01 16:43, Erik Rull wrote: > > 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 > > So commit aad3b517a1b83561f2755dc4451596a421399c19, i.e. the last merge > before that one is still fine? > > >>>>> 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? > > > > Yes, how much depends on your workload. > > Still strange, though. We should try to understand this issue. It stays > like this up to and including current qemu-kvm.git master? > > Jan > Hi Jan, I didn't follow the branch, only the master between 1.0 and head. Here my bisect log: git bisect start # good: [30c044521889195f54a9f2c21310894f545994e8] Merge commit 'v1.0' into next git bisect good 30c044521889195f54a9f2c21310894f545994e8 # bad: [2793248c5427c0bc585fdf9c101680bab29f4839] Merge remote-tracking branch 'upstream' into next git bisect bad 2793248c5427c0bc585fdf9c101680bab29f4839 # good: [262db38871b9a2613761cc5f05c4cf697e246a68] qemu-nbd: asynchronous operation git bisect good 262db38871b9a2613761cc5f05c4cf697e246a68 # good: [9737383beb515a583fdb6f2aafa631fcd6797068] qerror: add check-qerror.sh to verify alphabetical order git bisect good 9737383beb515a583fdb6f2aafa631fcd6797068 # skip: [fb5458cd10a199e55e622a906b24f8085d922c0f] qmp: add query-block-jobs git bisect skip fb5458cd10a199e55e622a906b24f8085d922c0f # skip: [aa398a5c3a4c0fc29baf02aee5283a7fa0f202a3] blockdev: make image streaming safe across hotplug git bisect skip aa398a5c3a4c0fc29baf02aee5283a7fa0f202a3 # good: [506b7ddf889312659b36c667f7ae17bc9e909418] prep: Use i82378 PCI->ISA bridge for 'prep' machine git bisect good 506b7ddf889312659b36c667f7ae17bc9e909418 # good: [31841e463fc069f3370f85060fbe450b3ff664b4] Merge remote-tracking branch 'pmaydell/arm-devs.for-upstream' into staging git bisect good 31841e463fc069f3370f85060fbe450b3ff664b4 # bad: [5fc4ecdf107133914f97590c8a27144ac0852d63] Merge commit '5b4448d27d7c6ff6e18a1edc8245cb1db783e37c' into queues/qemu-merge git bisect bad 5fc4ecdf107133914f97590c8a27144ac0852d63 # bad: [289a1056a2b902e25f8d6ec5e17984aa48d201c1] pci-assign: Fix multifunction support git bisect bad 289a1056a2b902e25f8d6ec5e17984aa48d201c1 # good: [7c82a98d17a2e86ce6d933dbdd01a570c7bb4ea8] Merge commit '03ecd2c80a64d030a22fe67cc7a60f24e17ff211' into upstream-merge git bisect good 7c82a98d17a2e86ce6d933dbdd01a570c7bb4ea8 # bad: [372951014b5008ca047e4dfbfaf4003bc27a2f6b] qemu-kvm: Fix save/restore of in-kernel i8259 git bisect bad 372951014b5008ca047e4dfbfaf4003bc27a2f6b # good: [682a3c07f0e28d2532c911a44a9b6142d6299cc2] Merge commit 'c5705a7728b4a6bc9e4f2d35911adbaf28042b25' into upstream-merge git bisect good 682a3c07f0e28d2532c911a44a9b6142d6299cc2 # good: [d33666a58d6da4554e69ed6036a052f7261c9298] Merge commit 'c47f3223658119219bbe0b8d09da733d1c06e76f' into upstream-merge git bisect good d33666a58d6da4554e69ed6036a052f7261c9298 # bad: [ec757c67c40a56492001487e69272f62144fd124] Merge branch 'upstream-merge' into next git bisect bad ec757c67c40a56492001487e69272f62144fd124 Best regards, Erik -- 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
