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On Thu, Sep 01, 2005 at 08:37:21PM +1000, QuantumG wrote:
> Sam Couter wrote:
>
> >No, what I said is correct. The kernel is largely irrelevant to the
> >end-user experience.
> >
> >
>
> Whether or not the kernel has real time scheduling or not makes one heck
> of a difference to the end-user experience. And, (for I think, the
> third time now?) although you can hack real time scheduling into a
> monolithic kernel it's not a sane thing to do.
MS-Windows (built on Non Trustworthy technology :-) has a level of priority
called "real time" which happens to make no real time guarantees and for
that matter is merely a "do your best" type of implementation.
On the other hand, so many people rave about how great the MS-Windows
user experience is... go figure.
Does RT-Linux count as hacking real time scheduling into a monolithic
kernel? Certainly the RT-Linux real time is as much a "hard real-time"
implementation as you can achieve on i386 architectures without using
dedicated I/O processors. I would say that the implementation is quite
sane although not particularly convenient for coding to (but then again,
99% of code doesn't need it and the small amount that does need it
also needs very careful design so the inconvenience of the API is
probably the least of your problems). In other words, taking regular
user-space bloatware applications and cranking up their priority to
something that happens to be called "real time" is a meaningless gesture.
- Tel
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