🚀 go-pugleaf

uli@kino.intellektik.informatik.th-darmstadt.de (Ulrich Grepel) writes:
>this is a summary of the hints I've got for my problem with my unused but
>enabled serial ports eating up my CPU:

Just disable them. - see 3a

>2. It seems to be the case that the ports generate interrupts.

They need to work correctly. Where other should the device driver know
from that the fifo needs to be emptied? It could busy wait, but this
would even nned more CPU.

>3. You can decrease CPU usage in several ways:
>   a) don't enable the ports
>   c) use the dsp together with additional hardware to get a high speed
>      serial port that doesn't use up your CPU

Would be interesting, but there are still many things to go on the
DSP-Port.

>4. The whole thing seems to be irrelevant of the OS version. I have 3.0, but
>   it was that bad much earlier. That's easy to understand since it is a
>   hardware problem.

It is not a problem! That's the way a device driver works. If NeXT had
used serial chips with 16 byte fifo for each serial port (and enabled
this 16 bytes fifo), interrupt load would have decreased.


-- 
Heiko W.Rupp  Gerwigstr.5  7500 Kh'e 1  hwr@pilhuhn.ka.sub.org  +49 721 693642
Mustgo, n.:
	Any item of food that has been sitting in the refrigerator so
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