Guest OS lock up with 100% cpu usage when using tap

Guest OS lock up with 100% cpu usage when using tap

[Daniel Paquet]

[-- Attachment #1.1: Type: text/plain, Size: 1135 bytes --]

Hello,

  This is a followup from my last message stating that my guest os dont load
up correctly. The problem was that my xp or vista guest os uses 100% cpu at
startup and frequent lockup then continue to load.

I played a bit with my startup parameters to find out that the problem is
related the to tap network interface, everything starts okay if I remove the
tap network from the startup parameters.

So my original startup was :
kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net
nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 -net tap,ifname=tap0 &

And now I used
kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net
nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 &

And the guest os boots correctly. I have this problem with kvm-33 and upward
to kvm-40 (I didn't tryed older releases as I need vista).

The thing is that I am using the tap interface to communicate with my guest
os and supply them with an Internet connection. So anyone have a clue or
something I may supply to help resolve this issue?

Thanks!


-- 
Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas configurer
Debian"
--
Daniel Paquet

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Re: Guest OS lock up with 100% cpu usage when using tap

[Avi Kivity]

Daniel Paquet wrote:
> Hello,
>
>   This is a followup from my last message stating that my guest os 
> dont load up correctly. The problem was that my xp or vista guest os 
> uses 100% cpu at startup and frequent lockup then continue to load.
>
> I played a bit with my startup parameters to find out that the problem 
> is related the to tap network interface, everything starts okay if I 
> remove the tap network from the startup parameters.
>
> So my original startup was :
> kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net 
> nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 -net tap,ifname=tap0 &
>
> And now I used
> kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net 
> nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 &
>
> And the guest os boots correctly. I have this problem with kvm-33 and 
> upward to kvm-40 (I didn't tryed older releases as I need vista).
>
> The thing is that I am using the tap interface to communicate with my 
> guest os and supply them with an Internet connection. So anyone have a 
> clue or something I may supply to help resolve this issue?
>

Interesting.  Maybe your network is flooded with broadcasts.  Try 
running wireshark or tcpdump on the tap interface and see if something 
is flowing through it at a high rate.

-- 
error compiling committee.c: too many arguments to function


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Re: Guest OS lock up with 100% cpu usage when using tap

[Daniel Paquet]

[-- Attachment #1.1: Type: text/plain, Size: 2318 bytes --]

Well this is very strange, to make it work I have to close the KVM window
and restart the guest, and eventually it will start right.

It is also starting right when I install a new version, like I just passed
from version 40 to 41 and tada my guests starts okay.

I dont have that much trafic on my tap device I just see some normal
broadcast but again now the machine starts okay. I will reboot my box and
see if I get the problem again. The bad thing is that it is not happening
all the time...

Maybe it has something to do with my network configuration. What I do is I
the tap0 is natted behind my eth0 with iptables. I startup the tap0
interface at bootup and I set the owner to the uid that starts the guest os.


Im rebooting now...

On 9/19/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
> Daniel Paquet wrote:
> > Hello,
> >
> >   This is a followup from my last message stating that my guest os
> > dont load up correctly. The problem was that my xp or vista guest os
> > uses 100% cpu at startup and frequent lockup then continue to load.
> >
> > I played a bit with my startup parameters to find out that the problem
> > is related the to tap network interface, everything starts okay if I
> > remove the tap network from the startup parameters.
> >
> > So my original startup was :
> > kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net
> > nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 -net tap,ifname=tap0 &
> >
> > And now I used
> > kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net
> > nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 &
> >
> > And the guest os boots correctly. I have this problem with kvm-33 and
> > upward to kvm-40 (I didn't tryed older releases as I need vista).
> >
> > The thing is that I am using the tap interface to communicate with my
> > guest os and supply them with an Internet connection. So anyone have a
> > clue or something I may supply to help resolve this issue?
> >
>
> Interesting.  Maybe your network is flooded with broadcasts.  Try
> running wireshark or tcpdump on the tap interface and see if something
> is flowing through it at a high rate.
>
> --
> error compiling committee.c: too many arguments to function
>
>


-- 
Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas configurer
Debian"
--
Daniel Paquet

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Re: Guest OS lock up with 100% cpu usage when using tap

[Daniel Paquet]

[-- Attachment #1.1: Type: text/plain, Size: 2516 bytes --]

Okay I just rebooted.

Now the guest os takes forever to startup with the same behaviour as before.

I have no traffic on my tap device. The only trafic on tap device is from
the guest os and for now there is not much.
And here is the output of dmesg

apic write: bad size=1 fee00030
Ignoring de-assert INIT to vcpu 0
kvm: emulating exchange as write

And the cpu usage it to 100% by system not user when locking up and goes to
user when running. It runs for 2-3 sec then hang and goes to 100% cpu usage
by system for 10 sec or more.

Im getting the same behaviour with my firewall (nat) disabled.
I just removed the tap device from the startup parameters and voila the
guest boots with no problems.

I reinsert my tap parameter and the guest os dont boot as before still with
nat and firewall disabled, tap device is up with an ip address.

Im still trying to do anything to solve this issue :-), feel free to give
some suggestions :).


On 9/19/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
> Daniel Paquet wrote:
> > Hello,
> >
> >   This is a followup from my last message stating that my guest os
> > dont load up correctly. The problem was that my xp or vista guest os
> > uses 100% cpu at startup and frequent lockup then continue to load.
> >
> > I played a bit with my startup parameters to find out that the problem
> > is related the to tap network interface, everything starts okay if I
> > remove the tap network from the startup parameters.
> >
> > So my original startup was :
> > kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net
> > nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 -net tap,ifname=tap0 &
> >
> > And now I used
> > kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net
> > nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 &
> >
> > And the guest os boots correctly. I have this problem with kvm-33 and
> > upward to kvm-40 (I didn't tryed older releases as I need vista).
> >
> > The thing is that I am using the tap interface to communicate with my
> > guest os and supply them with an Internet connection. So anyone have a
> > clue or something I may supply to help resolve this issue?
> >
>
> Interesting.  Maybe your network is flooded with broadcasts.  Try
> running wireshark or tcpdump on the tap interface and see if something
> is flowing through it at a high rate.
>
> --
> error compiling committee.c: too many arguments to function
>
>


-- 
Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas configurer
Debian"
--
Daniel Paquet

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Re: Guest OS lock up with 100% cpu usage when using tap

[Avi Kivity]

Daniel Paquet wrote:
> Okay I just rebooted.
>
> Now the guest os takes forever to startup with the same behaviour as 
> before.
>
> I have no traffic on my tap device. The only trafic on tap device is 
> from the guest os and for now there is not much.
> And here is the output of dmesg
>
> apic write: bad size=1 fee00030
> Ignoring de-assert INIT to vcpu 0
> kvm: emulating exchange as write
>
> And the cpu usage it to 100% by system not user when locking up and 
> goes to user when running. It runs for 2-3 sec then hang and goes to 
> 100% cpu usage by system for 10 sec or more.
>
> Im getting the same behaviour with my firewall (nat) disabled.
> I just removed the tap device from the startup parameters and voila 
> the guest boots with no problems.
>
> I reinsert my tap parameter and the guest os dont boot as before still 
> with nat and firewall disabled, tap device is up with an ip address.
>
> Im still trying to do anything to solve this issue :-), feel free to 
> give some suggestions :).
>

What about taskset?  'taskset 1 qemu ...'

-- 
error compiling committee.c: too many arguments to function


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Re: Guest OS lock up with 100% cpu usage when using tap

[Daniel Paquet]

[-- Attachment #1.1: Type: text/plain, Size: 1892 bytes --]

Well well, that did it!!!

For now I even restarted my host machine and the guest os boots flawlessly
now with taskset! Oh well, I now know a new nice linux app taskset :)

I saw similar problems with some games under windows, that you had to set
the affinity to a specific core, if not you were getting those kind of small
hang, like I was having with kvm and my guest machines.

And you guessed right I have a dual core cpu.

Anyone have an idea why this is only happening when using a tap network
interface? I am curious...

On 9/19/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
> Daniel Paquet wrote:
> > Okay I just rebooted.
> >
> > Now the guest os takes forever to startup with the same behaviour as
> > before.
> >
> > I have no traffic on my tap device. The only trafic on tap device is
> > from the guest os and for now there is not much.
> > And here is the output of dmesg
> >
> > apic write: bad size=1 fee00030
> > Ignoring de-assert INIT to vcpu 0
> > kvm: emulating exchange as write
> >
> > And the cpu usage it to 100% by system not user when locking up and
> > goes to user when running. It runs for 2-3 sec then hang and goes to
> > 100% cpu usage by system for 10 sec or more.
> >
> > Im getting the same behaviour with my firewall (nat) disabled.
> > I just removed the tap device from the startup parameters and voila
> > the guest boots with no problems.
> >
> > I reinsert my tap parameter and the guest os dont boot as before still
> > with nat and firewall disabled, tap device is up with an ip address.
> >
> > Im still trying to do anything to solve this issue :-), feel free to
> > give some suggestions :).
> >
>
> What about taskset?  'taskset 1 qemu ...'
>
> --
> error compiling committee.c: too many arguments to function
>
>


-- 
Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas configurer
Debian"
--
Daniel Paquet

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Re: Guest OS lock up with 100% cpu usage when using tap

[Avi Kivity]

Daniel Paquet wrote:
> Well well, that did it!!!
>
> For now I even restarted my host machine and the guest os boots 
> flawlessly now with taskset! Oh well, I now know a new nice linux app 
> taskset :)
>
> I saw similar problems with some games under windows, that you had to 
> set the affinity to a specific core, if not you were getting those 
> kind of small hang, like I was having with kvm and my guest machines.
>
> And you guessed right I have a dual core cpu.
>
> Anyone have an idea why this is only happening when using a tap 
> network interface? I am curious...

No idea.

Can you try one more thing?  -no-kvm-irqchip, but no taskset.  I'm 
trying to find out if the smp issue is with the apic code or elsewhere.

-- 
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Re: Guest OS lock up with 100% cpu usage when using tap

[Daniel Paquet]

[-- Attachment #1.1: Type: text/plain, Size: 1277 bytes --]

Well I rebooted again, and now my guest os starts right without taskset so
for now I using the -no-kvm-irqchip wont tell if thereis an issue with smp.
I will have to wait untill the problem gets back to try this parameter. I
will try it and send the results.

On 9/19/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
> Daniel Paquet wrote:
> > Well well, that did it!!!
> >
> > For now I even restarted my host machine and the guest os boots
> > flawlessly now with taskset! Oh well, I now know a new nice linux app
> > taskset :)
> >
> > I saw similar problems with some games under windows, that you had to
> > set the affinity to a specific core, if not you were getting those
> > kind of small hang, like I was having with kvm and my guest machines.
> >
> > And you guessed right I have a dual core cpu.
> >
> > Anyone have an idea why this is only happening when using a tap
> > network interface? I am curious...
>
> No idea.
>
> Can you try one more thing?  -no-kvm-irqchip, but no taskset.  I'm
> trying to find out if the smp issue is with the apic code or elsewhere.
>
> --
> error compiling committee.c: too many arguments to function
>
>


-- 
Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas configurer
Debian"
--
Daniel Paquet

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Re: Guest OS lock up with 100% cpu usage when using tap

[Avi Kivity]

Daniel Paquet wrote:
> Just tried -no-kvmirqchip and it's a no go, and after it I tryed 
> without taskset and -no-kvmirqchip and it worked... Anyway I will 
> allways use taskset until now.
>

Sorry, hard to piece all the info from the scattered reports.  Please 
report, for each of:

- regular
- -no-kvm-irqchip
- taskset

Whether you get

- reliable failure
- sometimes works, sometimes doesn't
- always works

so I can try to find a pattern.

Also, is tap required to reproduce the problem, or do you occasionally 
get it with -net user?


> On 9/19/07, * Avi Kivity* <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org <mailto:avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>> 
> wrote:
>
>     Daniel Paquet wrote:
>     > Well well, that did it!!!
>     >
>     > For now I even restarted my host machine and the guest os boots
>     > flawlessly now with taskset! Oh well, I now know a new nice
>     linux app
>     > taskset :)
>     >
>     > I saw similar problems with some games under windows, that you
>     had to
>     > set the affinity to a specific core, if not you were getting those
>     > kind of small hang, like I was having with kvm and my guest
>     machines.
>     >
>     > And you guessed right I have a dual core cpu.
>     >
>     > Anyone have an idea why this is only happening when using a tap
>     > network interface? I am curious...
>
>     No idea.
>
>     Can you try one more thing?  -no-kvm-irqchip, but no taskset.  I'm
>     trying to find out if the smp issue is with the apic code or
>     elsewhere.
>
>     --
>     error compiling committee.c: too many arguments to function
>
>
>
>
> -- 
> Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas 
> configurer Debian"
> --
> Daniel Paquet 


-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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Re: Guest OS lock up with 100% cpu usage when using tap

[Daniel Paquet]

[-- Attachment #1.1: Type: text/plain, Size: 2458 bytes --]

Okay so here is the parameters

regular :
kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net
nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 -net tap,ifname=tap0

Well for the others I just add taskset 1 or -no-kvm-irqchip

regular = sometimes work, sometimes dont work.
-no-kvm-irqchip = never worked
taskset = always work for now


On 9/19/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
> Daniel Paquet wrote:
> > Just tried -no-kvmirqchip and it's a no go, and after it I tryed
> > without taskset and -no-kvmirqchip and it worked... Anyway I will
> > allways use taskset until now.
> >
>
> Sorry, hard to piece all the info from the scattered reports.  Please
> report, for each of:
>
> - regular
> - -no-kvm-irqchip
> - taskset
>
> Whether you get
>
> - reliable failure
> - sometimes works, sometimes doesn't
> - always works
>
> so I can try to find a pattern.
>
> Also, is tap required to reproduce the problem, or do you occasionally
> get it with -net user?
>
>
> > On 9/19/07, * Avi Kivity* <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org <mailto:avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>>
> > wrote:
> >
> >     Daniel Paquet wrote:
> >     > Well well, that did it!!!
> >     >
> >     > For now I even restarted my host machine and the guest os boots
> >     > flawlessly now with taskset! Oh well, I now know a new nice
> >     linux app
> >     > taskset :)
> >     >
> >     > I saw similar problems with some games under windows, that you
> >     had to
> >     > set the affinity to a specific core, if not you were getting those
> >     > kind of small hang, like I was having with kvm and my guest
> >     machines.
> >     >
> >     > And you guessed right I have a dual core cpu.
> >     >
> >     > Anyone have an idea why this is only happening when using a tap
> >     > network interface? I am curious...
> >
> >     No idea.
> >
> >     Can you try one more thing?  -no-kvm-irqchip, but no taskset.  I'm
> >     trying to find out if the smp issue is with the apic code or
> >     elsewhere.
> >
> >     --
> >     error compiling committee.c: too many arguments to function
> >
> >
> >
> >
> > --
> > Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas
> > configurer Debian"
> > --
> > Daniel Paquet
>
>
> --
> Any sufficiently difficult bug is indistinguishable from a feature.
>
>


-- 
Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas configurer
Debian"
--
Daniel Paquet

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