2008/7/14 Bernd Petrovitsch <bernd@xxxxxxxxx>: > On Mon, 2008-07-14 at 20:47 +0200, Roberto A. Foglietta wrote: >> 2008/7/14 Robert P. J. Day <rpjday@xxxxxxxxxxxxxx>: >> > >> > is there a good online explanation of the difference WRT linux? >> > thanks. >> >> Sorry for the attachment but an image is better than many words (sometime)! >> :-) >> >> <word on> >> hwrt: missing the deadline means crashing the system > "system" meaning the controlled thing (like an airplane or a train) and > not only the computer. > Usually the value of the computer are much lesser than the value of controlled thing otherwise using a computer does not worth the effort/investment. ;-) However I was thinking at the system as the sum of computer + software + controlled thing. The difference between sw/hw rt is the smoothness of the curve after the missed deadline: hard or soft system dead. The word "crash" as been used to transmit the concept of irreversible damage (crashing a plane, car, etc. etc.) while loosing some frame in a audio/video transmission usually reduce the quality/value/pleasure of the transmission but it is not such a crash becase we can live with it and keep on. >> swrt: missing the deadline means loosing quality of service > or just loosing the benefit >> <word off> > Loosing the benefit could happen sharply at the missing of the deadline or smoothly, in the second case I think "loosing the quality of service" (whatever the service is) is meaningful enough about loosing smoothly. Cheers, -- /roberto -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
