kvm-50 working with smp

kvm-50 working with smp

[Farkas Levente]

hi,
it seems the latest kvm-50 working with smp both with 32 and 64 bit
centos-5 are now running (ie not crash), what's more it's even working
if i trun back (ie on) acpi. but it seems much more slower with 2 guests
4 vcpu then kvm-36 with 2 guests single cpu. is so much slower then it
can be recognized even just http response or anything else:-(
another problem the windows xp guest eat 100% all the time.

-- 
  Levente                               "Si vis pacem para bellum!"

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Re: kvm-50 working with smp

[Avi Kivity]

Farkas Levente wrote:
> hi,
> it seems the latest kvm-50 working with smp both with 32 and 64 bit
> centos-5 are now running (ie not crash), what's more it's even working
> if i trun back (ie on) acpi. but it seems much more slower with 2 guests
> 4 vcpu then kvm-36 with 2 guests single cpu. is so much slower then it
> can be recognized even just http response or anything else:-(
> another problem the windows xp guest eat 100% all the time.
>
>   

Without FlexPriority (or tpr patching) Windows SMP is very slow.  It 
shouldn't take 100% cpu though.  If this is immediately after boot, wait 
a couple of minutes to let Windows load all its services.

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


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Re: kvm-50 working with smp

[Farkas Levente]

Avi Kivity wrote:
> Farkas Levente wrote:
>> hi,
>> it seems the latest kvm-50 working with smp both with 32 and 64 bit
>> centos-5 are now running (ie not crash), what's more it's even working
>> if i trun back (ie on) acpi. but it seems much more slower with 2 guests
>> 4 vcpu then kvm-36 with 2 guests single cpu. is so much slower then it
>> can be recognized even just http response or anything else:-(
>> another problem the windows xp guest eat 100% all the time.
>>
>>   
> 
> Without FlexPriority (or tpr patching) Windows SMP is very slow.  It
> shouldn't take 100% cpu though.  If this is immediately after boot, wait
> a couple of minutes to let Windows load all its services.

but not just the windows are slow even all linux centos-5 32 and 64 bit
version are _very_ slow much more slower than kvm-46 even the user
experience is a few times slower the with kvm-46 with single cpu!

-- 
  Levente                               "Si vis pacem para bellum!"

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Re: kvm-50 working with smp

[Avi Kivity]

Farkas Levente wrote:
> Avi Kivity wrote:
>   
>> Farkas Levente wrote:
>>     
>>> hi,
>>> it seems the latest kvm-50 working with smp both with 32 and 64 bit
>>> centos-5 are now running (ie not crash), what's more it's even working
>>> if i trun back (ie on) acpi. but it seems much more slower with 2 guests
>>> 4 vcpu then kvm-36 with 2 guests single cpu. is so much slower then it
>>> can be recognized even just http response or anything else:-(
>>> another problem the windows xp guest eat 100% all the time.
>>>
>>>   
>>>       
>> Without FlexPriority (or tpr patching) Windows SMP is very slow.  It
>> shouldn't take 100% cpu though.  If this is immediately after boot, wait
>> a couple of minutes to let Windows load all its services.
>>     
>
> but not just the windows are slow even all linux centos-5 32 and 64 bit
> version are _very_ slow much more slower than kvm-46 even the user
> experience is a few times slower the with kvm-46 with single cpu!
>
>   

That shouldn't happen.  Which kvm version introduced the problem 
(anything between -46 and -50)?  Did you change anything other than kvm?

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


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Re: kvm-50 working with smp

[Farkas Levente]

Avi Kivity wrote:
> Farkas Levente wrote:
>> Avi Kivity wrote:
>>  
>>> Farkas Levente wrote:
>>>    
>>>> hi,
>>>> it seems the latest kvm-50 working with smp both with 32 and 64 bit
>>>> centos-5 are now running (ie not crash), what's more it's even working
>>>> if i trun back (ie on) acpi. but it seems much more slower with 2
>>>> guests
>>>> 4 vcpu then kvm-36 with 2 guests single cpu. is so much slower then it
>>>> can be recognized even just http response or anything else:-(
>>>> another problem the windows xp guest eat 100% all the time.
>>>>
>>>>         
>>> Without FlexPriority (or tpr patching) Windows SMP is very slow.  It
>>> shouldn't take 100% cpu though.  If this is immediately after boot, wait
>>> a couple of minutes to let Windows load all its services.
>>>     
>>
>> but not just the windows are slow even all linux centos-5 32 and 64 bit
>> version are _very_ slow much more slower than kvm-46 even the user
>> experience is a few times slower the with kvm-46 with single cpu!
>>
>>   
> 
> That shouldn't happen.  Which kvm version introduced the problem
> (anything between -46 and -50)?  Did you change anything other than kvm?

we don't change anything else (except try to use smp in guest and update
to 50). i don't know which version. i know kvm-46 with single cpu was
working in a reasonable speed while kvm-50 is about 10 times (!) slower
with 4 vcpu.

-- 
  Levente                               "Si vis pacem para bellum!"

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