Ubuntu Gutsy host / XP guest / -smp 2

Ubuntu Gutsy host / XP guest / -smp 2

[David Abrahams]

With the title combination, the guest takes nearly 100% of my real CPU
time and still only sees one CPU.  Is this a known problem, and does it
have a known solution?

Thanks in Advance,

-- 
Dave Abrahams
Boost Consulting
http://boost-consulting.com


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Re: Ubuntu Gutsy host / XP guest / -smp 2

[Avi Kivity]

David Abrahams wrote:
> With the title combination, the guest takes nearly 100% of my real CPU
> time and still only sees one CPU.  Is this a known problem, and does it
> have a known solution?
>
>   

Can you send the output of 'kvm_stat -1'?  Also, what does the guest 
think it is doing (in task manager, etc.)?

What HAL do you see in device manager?

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


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Re: Ubuntu Gutsy host / XP guest / -smp 2

[David Abrahams]

on Wed Apr 02 2008, Avi Kivity <avi-AT-qumranet.com> wrote:

> David Abrahams wrote:
>> With the title combination, the guest takes nearly 100% of my real CPU
>> time and still only sees one CPU.  Is this a known problem, and does it
>> have a known solution?
>>
>>   
>
> Can you send the output of 'kvm_stat -1'?  

I don't appear to have a kvm_stat executable anywhere.  How do I acquire
that?

> Also, what does the guest
> think it is doing (in task manager, etc.)?

System Idle Process :(

Everything is calm in the guest, but "top" in the host shows a kvm
process at between 50 and 70 percent of the CPU.

> What HAL do you see in device manager?

In the guest?  I don't see anything that obviously appears to be HAL in
device manager.  Could you be more specific?

Sorry to be so clueless, and thanks again in advance,

-- 
Dave Abrahams
Boost Consulting
http://boost-consulting.com

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Re: Ubuntu Gutsy host / XP guest / -smp 2

[Liu, Eric E]

David Abrahams wrote:
> on Wed Apr 02 2008, Avi Kivity <avi-AT-qumranet.com> wrote:
> 
>> David Abrahams wrote:
>>> With the title combination, the guest takes nearly 100% of my real
>>> CPU time and still only sees one CPU.  Is this a known problem, and
>>> does it have a known solution? 
>>> 
>>> 
>> 
>> Can you send the output of 'kvm_stat -1'?
> 
> I don't appear to have a kvm_stat executable anywhere.  How do I
> acquire that?
Hi David,
	Do you have kvm userspace code? If you have, you can find it in
kvm-userspace/kvm_stat. And you also can get the code from "git clone
git://git.kernel.org/pub/scm/virt/kvm/kvm-userspace.git".


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Re: Ubuntu Gutsy host / XP guest / -smp 2

[Jim Paris]

David Abrahams wrote:
> > What HAL do you see in device manager?
> 
> In the guest?  I don't see anything that obviously appears to be HAL in
> device manager.  Could you be more specific?

Hi,

He's referring to the Windows computer type -- the entry under
"computer" in device manager.  See
  http://kvm.qumranet.com/kvmwiki/Windows_ACPI_Workaround

-jim

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Re: Ubuntu Gutsy host / XP guest / -smp 2

[David Abrahams]

on Wed Apr 02 2008, Avi Kivity <avi-AT-qumranet.com> wrote:

> David Abrahams wrote:
>> With the title combination, the guest takes nearly 100% of my real CPU
>> time and still only sees one CPU.  Is this a known problem, and does it
>> have a known solution?
>>
>>   
>
> Can you send the output of 'kvm_stat -1'?  

$ ./kvm_stat -1
exits                    5919444     74219
halt_exits               1746937     59420
invlpg                         0         0
io_exits                 2181506      6569
irq_exits                  23055       335
irq_window                  2839        77
mmio_exits                200851         0
pf_fixed                 1160592      6251
pf_guest                   43473       396
request_irq                    0         0
signal_exits               24838       281
tlb_flush                  37381      1132


> Also, what does the guest
> think it is doing (in task manager, etc.)?

"System Idle Process"

Note that right now, with my laptop running on battery, kvm is taking up
"only" about 50% of the real CPU.

> What HAL do you see in device manager?

Jim Paris wrote:
> He's referring to the Windows computer type -- the entry under
> "computer" in device manager.  See
>   http://kvm.qumranet.com/kvmwiki/Windows_ACPI_Workaround

"Standard PC"

For what it's worth, kvm was not started with "-smp 2" when XP was
installed; I only discovered that option later.

Thanks,

-- 
Dave Abrahams
Boost Consulting
http://boost-consulting.com

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Re: Ubuntu Gutsy host / XP guest / -smp 2

[Avi Kivity]

David Abrahams wrote:
> on Wed Apr 02 2008, Avi Kivity <avi-AT-qumranet.com> wrote:
>
>   
>> David Abrahams wrote:
>>     
>>> With the title combination, the guest takes nearly 100% of my real CPU
>>> time and still only sees one CPU.  Is this a known problem, and does it
>>> have a known solution?
>>>
>>>   
>>>       
>> Can you send the output of 'kvm_stat -1'?  
>>     
>
> $ ./kvm_stat -1
> exits                    5919444     74219
> halt_exits               1746937     59420
> invlpg                         0         0
> io_exits                 2181506      6569
> irq_exits                  23055       335
> irq_window                  2839        77
> mmio_exits                200851         0
> pf_fixed                 1160592      6251
> pf_guest                   43473       396
> request_irq                    0         0
> signal_exits               24838       281
> tlb_flush                  37381      1132
>
>   

Versions of kvm producing this sort of output are common in 
archaeological digs.  Please try a more recent release.

>> What HAL do you see in device manager?
>>     
> "Standard PC"
>
>   

This HAL does not support SMP.  You need the "ACPI Multiprocessor PC" 
HAL or some such.

Unless you have a recent Intel processor, the combination of SMP and 
Windows XP will give noticeably lower performance.  I recommend sticking 
with uniprocessor in such cases.

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


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Re: Ubuntu Gutsy host / XP guest / -smp 2

[David Abrahams]

Avi Kivity wrote:
> David Abrahams wrote:
>> on Wed Apr 02 2008, Avi Kivity <avi-AT-qumranet.com> wrote:
>>
>>  
>>> David Abrahams wrote:
>>>    
>>>> With the title combination, the guest takes nearly 100% of my real CPU
>>>> time and still only sees one CPU.  Is this a known problem, and does it
>>>> have a known solution?
>>>>
>>>>         
>>> Can you send the output of 'kvm_stat -1'?      
>>
>> $ ./kvm_stat -1
>> exits                    5919444     74219
>> halt_exits               1746937     59420
>> invlpg                         0         0
>> io_exits                 2181506      6569
>> irq_exits                  23055       335
>> irq_window                  2839        77
>> mmio_exits                200851         0
>> pf_fixed                 1160592      6251
>> pf_guest                   43473       396
>> request_irq                    0         0
>> signal_exits               24838       281
>> tlb_flush                  37381      1132
>>
>>   
> 
> Versions of kvm producing this sort of output are common in
> archaeological digs.  Please try a more recent release.

Well, I'll try Hardy Heron soon enough, I suppose.  It's due out in 2
weeks.

I'm sure you understand that most people can't afford to rebuild all
their important software so that it stays on the bleeding edge.  Have
you considered getting more recent versions of kvm into the updates or
backports repositories of major distros?  I'm not really sure how much
influence you can have over such things; I'm just asking.

>>> What HAL do you see in device manager?
>>>     
>> "Standard PC"
>>
>>   
> 
> This HAL does not support SMP.  You need the "ACPI Multiprocessor PC"
> HAL or some such.

And how would I get that HAL set up?

> Unless you have a recent Intel processor, the combination of SMP and
> Windows XP will give noticeably lower performance.  I recommend sticking
> with uniprocessor in such cases.

I have a Core Duo; isn't that recent enough?

-- 
Dave Abrahams
Boost Consulting
http://boost-consulting.com

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Re: Ubuntu Gutsy host / XP guest / -smp 2

[Avi Kivity]

David Abrahams wrote:
>>>   
>>>       
>> Versions of kvm producing this sort of output are common in
>> archaeological digs.  Please try a more recent release.
>>     
>
> Well, I'll try Hardy Heron soon enough, I suppose.  It's due out in 2
> weeks.
>
> I'm sure you understand that most people can't afford to rebuild all
> their important software so that it stays on the bleeding edge.  Have
> you considered getting more recent versions of kvm into the updates or
> backports repositories of major distros?  I'm not really sure how much
> influence you can have over such things; I'm just asking.
>
>   

That's up to the distro maintainers, or concerned users (who may either 
volunteer work or apply pressure).

>>>> What HAL do you see in device manager?
>>>>     
>>>>         
>>> "Standard PC"
>>>
>>>   
>>>       
>> This HAL does not support SMP.  You need the "ACPI Multiprocessor PC"
>> HAL or some such.
>>     
>
> And how would I get that HAL set up?
>
>   

Follow http://kvm.qumranet.com/kvmwiki/Windows_ACPI_Workaround, 
substituting your desired HAL for "Standard PC".

>> Unless you have a recent Intel processor, the combination of SMP and
>> Windows XP will give noticeably lower performance.  I recommend sticking
>> with uniprocessor in such cases.
>>     
>
> I have a Core Duo; isn't that recent enough?
>   

No, this feature is present only on some of the Core 2s, IIRC.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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Re: Ubuntu Gutsy host / XP guest / -smp 2

[David Abrahams]

Avi Kivity wrote:
> David Abrahams wrote:
>>>>         
>>> Versions of kvm producing this sort of output are common in
>>> archaeological digs.  Please try a more recent release.
>>>     
>>
>> Well, I'll try Hardy Heron soon enough, I suppose.  It's due out in 2
>> weeks.
>>
>> I'm sure you understand that most people can't afford to rebuild all
>> their important software so that it stays on the bleeding edge.  Have
>> you considered getting more recent versions of kvm into the updates or
>> backports repositories of major distros?  I'm not really sure how much
>> influence you can have over such things; I'm just asking.
> 
> That's up to the distro maintainers, or concerned users (who may either
> volunteer work or apply pressure).

Well Hardy is due out, like, tomorrow or something.  Its kvm seems to be
much newer.

>>>>> What HAL do you see in device manager?
>>>>>             
>>>> "Standard PC"
>>>>
>>>>         
>>> This HAL does not support SMP.  You need the "ACPI Multiprocessor PC"
>>> HAL or some such.
>>>     
>>
>> And how would I get that HAL set up?
>>
>>   
> 
> Follow http://kvm.qumranet.com/kvmwiki/Windows_ACPI_Workaround,
> substituting your desired HAL for "Standard PC".

Thanks.

>>> Unless you have a recent Intel processor, the combination of SMP and
>>> Windows XP will give noticeably lower performance.  I recommend sticking
>>> with uniprocessor in such cases.
>>>     
>>
>> I have a Core Duo; isn't that recent enough?
>>   
> 
> No, this feature is present only on some of the Core 2s, IIRC.

Huh.  What is the feature called?


-- 
Dave Abrahams
Boost Consulting
http://boost-consulting.com

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Re: Ubuntu Gutsy host / XP guest / -smp 2

[Avi Kivity]

David Abrahams wrote:
>>>> Unless you have a recent Intel processor, the combination of SMP and
>>>> Windows XP will give noticeably lower performance.  I recommend sticking
>>>> with uniprocessor in such cases.
>>>>     
>>>>         
>>> I have a Core Duo; isn't that recent enough?
>>>   
>>>       
>> No, this feature is present only on some of the Core 2s, IIRC.
>>     
>
> Huh.  What is the feature called

FlexPriority.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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