Re: kvm-50 working with smp

Farkas Levente
2007-11-05T15:19:22Z

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.