Tue, 16 Jan 2001 Nathan Paul Simons wrote:
> On Tue, Jan 16, 2001 at 08:38:30AM -0700, [EMAIL PROTECTED] wrote:
> > You could have asked me: aside from getting wierd OS failures (which is
> > always fun) there is a really interesting area in which "soft" realtime
> > applications interact with hard realtime applications: e.g. hard RT
> > collects frames, feeds them to a soft RT which does some mixing, and hard
> > RT outputs.
> > I think that the area in which hard and soft RT cooperate is one of the most
> > important research&development areas in OS.
>
> I stand humbled. My apologies if I seemed overly negative towards the
> question of using the low latency patch. It's just that it seems like
> applications that require low latency could be deftly handled by using hard
> real time, and the low latency patch has a lot of provisos for its use. There
> was much discussion on the Linux kernel list about the issues that the low
> latency patch raised. While many people said that it Worked For Them(tm), it
> looked like the patch would not be compatible with many drivers and perhaps
> even platforms (did anyone ever test the patch on anything besides ia32?).
Actually, apart from some versions of the lowlatency patch not really working
(ie not covering all kernel calls), and some user space drivers (like XFree86)
and applications having built-in deadlocks that are exposed only if they're
running SCHED_FIFO, there's nothing much to worry about. Use kernel drivers,
libraries and other stuff as much as you like, but keep in mind that (just as
with RTL, RTAI, QNX or whatever) if you access something that's inherently
nondeterministic, that will impact the performance of your code.
//David
..- M A I A -------------------------------------------------.
| Multimedia Application Integration Architecture |
| A Free/Open Source Plugin API for Professional Multimedia |
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..- David Olofson -------------------------------------------.
| Audio Hacker - Open Source Advocate - Singer - Songwriter |
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