Messages in this thread |  | | Date | Tue, 4 Sep 2001 08:40:48 -0700 (PDT) | From | Joel Jaeggli <> | Subject | Re: Should I use Linux to develop driver for specialized ISA card? |
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Fred, I'd check out the faq on rtlinux...
"Worst-case times are about 15microseconds between the assertion of an interrupt and the starting of the realtime handler on a generic x86 PC"
there where patches in the 2.2 era (some kind of midi related flamefest occured at that time) that would take the average in a 2.2 kenel down to 25Us but the worst case was still fairly large...
what a rtos buys is not generally performance but a much higher level determinism than what we can arrive at.
joelja
On Tue, 4 Sep 2001, Fred wrote:
> I'm curious, Alan, Why? I'm a hardware developer, and I would have assumed > that linux would have been ideal for real time / embedded projects? (routers > / controllers / etc.) Is there, for instance, a reason to suspect that linux > would not be able to respond to interrupts at say 8Khz? > of course I know nothing of rtlinux so I'll read. > > TIA > Fred > > > _________________________________________________ > On Tuesday 04 September 2001 10:15 am, Alan Cox wrote: > > > The moving parts of the plotter are controlled by ISA card that generates > > > (and responds to) interrupts on each movement or printing event. > > > The interrupts can be generated quite fast; up to frequency of 4kHz. > > > > Thats fine. The issue you might need to consider is how long you can wait > > between an irq and actually excuting the handler. If that is very tight > > then you may want Victor Yodaiken's rtlinux > > - > > 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/ > - > 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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