Re: [Xenomai-help] Running Xenomai in a virtual machine

[Johan Visser <johan.visser@domain.hid>]

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Jan Kiszka schreef:
> Gilles Chanteperdrix wrote:
>   
>> Jan Kiszka wrote:
>>     
>>> Johan Visser wrote:
>>>       
>>>> VMware runs, but gives heavy CPU load ( about 38 % ) instead of 6-8 % on
>>>> a real system.
>>>>         
>>> That's expected if your CPU actually lacks hardware virtualization.
>>>       
>> An idle guest used to consume almost nothing on a vmware host. Only
>> MS-DOS needed a special TSR to have its idle mode not consume 100%. On
>> the other hand, the last time I used vmware was 5 years ago...
>>     
>
> I meant the scale is expected: If basically the same system runs with
> some non-zero load on real hw, the load that this machine inside a
> code-translating hypervisor like vmware causes to its host will be
> noticeably larger. But even the idle load can be noteworthy if I/O
> emulation causes a lot of host activities, even with HVM.
>
> Jan
>
>   
Tested QEMU as well, boots and runs completely.
it seems to be more jumpy in CPU load and has about 10% more load then 
VMware , after a short time ( minutes ) our application crashes because 
of a userspace watchdog we have implemented. this detects a lack of 
taskswitches in userspace.
( i use a dualcore 2x2.0Ghz centrino CPU. A real celeron @ 400MHz gives 
me12% CPU load in real-time :)
Also the idle task gives max CPU load at first. but after some 
user-interface actions (mouse clicks ) this reduces to 0%.
I will have to investigate more, but have a lack of time now.
cheers




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