Re: kvm-45 problems

Zhao, Yunfeng
2007-10-09T07:30:15Z

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We run some booting multiple guest tests in our nightly testing.
Like booting two UP windows guests, booting one UP linux guest and one UP windows guest, and booting 4 UP linux guests.
The first two cases have no problem in our testing.
And booting 4 UP linux guests may crash host, but this problem doesn't happen very time. If the problem didn't happen, linux guest can be log in without any problem.

For smp guest, we meet a problem that booting linux guest with 4 vcpus causes soft lock error on host. Once this error happened, qemu process also could not be killed.

Our linux guests are using 2.6.9, 2.6.16, and 2.6.23 kernels.

Thanks
Yunfeng

>-----Original Message-----
>From: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>[mailto:kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Farkas Levente
>Sent: 2007年10月9日 14:45
>To: Dong, Eddie
>Cc: kvm-devel
>Subject: Re: [kvm-devel] kvm-45 problems
>
>Dong, Eddie wrote:
>> kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org wrote:
>>> hi,
>>> i'm just try kvm-45. for me it still unusable, so switch back
>>> to kvm-36:-(
>>> setup:
>>> - host: centos-5 x86-64 (4 core, 8gb ram)
>>> - guest:
>>> - centos-5 i386 4 cpu, 2gb
>>> - centos-5 x86-64 4 cpu, 1gb
>>> - mandrake-9 i586 2 cpu, 1gb
>>> - winxp 32bit 1gb
>>> the problems:
>>> after start the above setup none of the guest be able to boot until
>>> login screen (except winxp?:-( i attached the guest's virt-manager
>>> screenshots. the worse thing comes when i try to stop the guests.
>>> virt-manager crash. after that i try to kill qemu-kvm's but it was
>>> simple not possible!:-( ---------------------------------
>>> Ignoring de-assert INIT to vcpu 0
>>> Ignoring de-assert INIT to vcpu 1
>>> vcpu 1 received sipi with vector # 10
>>> vcpu 2 received sipi with vector # 10
>>> vcpu 3 received sipi with vector # 10
>>> kvm: emulating exchange as write
>>> vcpu 1 received sipi with vector # 3
>>> vcpu 2 received sipi with vector # 3
>>> vcpu 3 received sipi with vector # 3
>>> vcpu 1 received sipi with vector # 10
>>> vcpu 2 received sipi with vector # 10
>>> vcpu 3 received sipi with vector # 10
>>> vcpu 1 received sipi with vector # 10
>>> vcpu 1 received sipi with vector # 6
>>> vcpu 2 received sipi with vector # 6
>>> vcpu 3 received sipi with vector # 6
>>> ---------------------------------
>>> in the host dmesg:
>>> ---------------------------------
>>> Ignoring de-assert INIT to vcpu 1
>>> SIPI to vcpu 1 vector 0x06
>>> vcpu 1 received sipi with vector # 6
>>> SIPI to vcpu 1 vector 0x06
>>> Ignoring de-assert INIT to vcpu 2
>>> SIPI to vcpu 2 vector 0x06
>>> vcpu 2 received sipi with vector # 6
>>> SIPI to vcpu 2 vector 0x06
>>> Ignoring de-assert INIT to vcpu 3
>>> SIPI to vcpu 3 vector 0x06
>>> vcpu 3 received sipi with vector # 6
>>> SIPI to vcpu 3 vector 0x06
>>> ---------------------------------
>>> so try to reboot, but the host crash during the shutdown (i've no
>>> screenshot of this and the important part are scrolled up), so
>>> reset:-( on the host console: the strange thing that after i reboot
>>> and replace all guest to 1 cpu all of the guests boot except the
>>> centos-i386 which also hang (may be because this is the only guest
>>> which has 2gb ram assigned?) but i still not able to login to them
>>> (except winxp), ie. after boot neither from console nor from remote i
>>> can't connect it's looks like guests are frozen, but there is nothing
>>> on the host console or log files.
>>> so i revert to kvm-36 which working with 1cpu/guest.
>>> my real question i do something wrong or just no one use more cpu and
>>> more guest on such and old kernel as centos's
>>> 2.6.18-8.1.14.el5:-( or my
>>> hardware are so strange?
>>>
>> Did u try above configuration in KVM-36 (i.e. multiple guest + SMP)?
>
>smp is not working in kmv-36, but multiple guest with single cpu is stable.
>
>--
> Levente "Si vis pacem para bellum!"
>
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