Hi!
20-Июл-2006 18:43 [EMAIL PROTECTED] (Andreas Bollhalder) wrote to
[email protected]:
>> Does this mean, that when you run some program, which shows clock (for
>> example, Norton and Volcov Commander may show clock), then this clock is too
>> fast? And how it fast - 1.5 logical seconds per real second? 2 second per
>> second? 100 seconds per second?
AB> As I can tell from my experince, the factor depends a lot from the host
AB> speed and emulation / virtualisation software. I saw speed differences
AB> from about a bit faster ( > 1.0) up to 10 times.
Wow! Looks like this is dangerous to run real-time software (like
game-shooters or drivers for external devices) under these emulators!
AB> Most emulators / virtualizer are now close to 1 (as of QEMU and VMware).
AB> There is no real / perfect solution to have a precise clock in a VM.
AB> This is because it would have a big performance penalty.
Let me doubt in this - for example, for DOS window, emulator may copy
values from BIOS memory (for example, when there is access to low memory,
where BIOS data area resides). After all, MS Windows somewhat solves similar
problems?
AB> Another thing when running FreeDOS in a VM is the CPU usage of the host
AB> machine. It will be go to 100% and the CPU fan will start. I use always
AB> the FDAPM with the parameter APMDOS so the HLT command is used (I think
AB> it's the instruction).
Yes. Also, Eric was told about using other advanced techniques.
AB> With this, the host CPU is about 4% usage on my
AB> 1GHz WinXP machine, like with any other program when idle. It think it
AB> would be a good idea to include the loading of FDAPM in the FreeDOS
AB> distro, as I think a lot of the people will try out FreeDOS in a VM.
Yes, FDAPM good program, congratulations to Eric. :)
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