Re: ABAT Testing report, kernel 3415130f97.., userspace 5b16d32e..

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Avi Kivity wrote:
>>>  
>>>>       
>>> This is an SMP guest?  What HAL does it use?
>>>     
>> [Yunfeng] With ACPI HAL, both UP and SMP is slow. In my testing with 
>> 2 vcpus to boot win2k needs more than 4 minutes.(From
>> booting to network started).
>>
>>   
>
> This happens here too, with kvm versions as far back as kvm-20.  But 
> with a clean install of Windows XP, it starts in about a minute (under 
> the ACPI HAL) and idles using a few percent host cpu.  Looks like some 
> Windows update causes this, not a kvm regression.
>
>

It's not a Windows update.  A new Windows install works well, as it will 
after all updates.  If you boot it in an smp configuration, however, it 
will update its kernel, and the new kernel will exhibit the problem, 
even if booted later with a single vcpu.

The guest will consume 100% cpu even though kvm_stat shows 6000 
exits/sec, which leads me to suspect the idle loop is spinning instead 
of executing a 'hlt' instruction.

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


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