Messages in this thread | | | Date | Thu, 21 Jun 2007 20:26:14 +0200 (CEST) | From | Jan Engelhardt <> | Subject | Re: Limiting load of certain processes |
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On Jun 21 2007 19:50, Jan Kandziora wrote: > >Dear all, > >I like to use an old DOS/Clipper application through DOSEMU on a Linux >application server in a hotel. It works, but (as usual with DOS), it causes >a processor load of 100% in certain situations, while just waiting for user >interaction.
That's how it is. When DOS was written, cpu relaxing like the HLT instruction was not known yet (or was it?), so everything was (and still is) a busy loop.
(Yes, including today's typical x86 BIOSes. Aw crap!)
Of course there may be hacks that try to figure out if a DOS window is idle, waiting for user input. (Seems like a new invention in Windows 2000 and up). Since dosemu and all the emulators are not running a genuine Microsoft DOS / have source, it should be easy game for them to wait non-busily. Or maybe busy-waiting is _part_ of the emulation; maybe some DOS driver(s) require it.
Jan -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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