[Qemu-devel] Simulation or just emulation?

[Qemu-devel] Simulation or just emulation?

[Abdullah AL-Mutairi]

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Hello, I've testing some ARM machines and CPU's through qemu-arm, for sure had different results through different systems, but I'm still wondering, does qemu simulates the behavior of ARM machines, or just emulate the code? 
Thanks!

مآبقى إلا أسمانا تنقش على سطح القمر، هيبة المطران من هيبة البحر الغزير.

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Re: [Qemu-devel] Simulation or just emulation?

[Stefan Hajnoczi]

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On Sun, Mar 29, 2015 at 01:36:47AM +0300, Abdullah AL-Mutairi wrote:
> does qemu simulates the behavior of ARM machines, or just emulate the code? 

QEMU is an emulator.  It does not simulate cycle timings, caches, etc.

Stefan

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Re: [Qemu-devel] Simulation or just emulation?

[Abdullah Al-Mutairi]

Thank you stefan, this should be the case, as I did later compare an 
QEMU machine with a real machine, The VM gave "2X" the results of a real 
hardware using openssl rsa4096.

On 03/30/2015 06:28 PM, Stefan Hajnoczi wrote:
> On Sun, Mar 29, 2015 at 01:36:47AM +0300, Abdullah AL-Mutairi wrote:
>> does qemu simulates the behavior of ARM machines, or just emulate the code?
> QEMU is an emulator.  It does not simulate cycle timings, caches, etc.
>
> Stefan