Re: Should I use Linux to develop driver for specialized ISA card?

[J Sloan <jjs@toyota.com>]

Roger Larsson wrote:

> 1) Why shouldn't the low-latency patches work for another architecture?
> Andrew Morton might be interested to fix other architectures too.
> (but most patches are not in architecture specific code)
>
> 2) Montavistas reschedulable kernel is a very interesting approach, newly
> released an update by Robert Love
>   http://kpreempt.sourceforge.net/
>   http://tech9.net/rml/linux/patch-rml-2.4.10-pre2-preempt-kernel-1
> (there are still some spikes, but the floor is smooth)
>
> But note you with both approaches you want to run the latency critical process
> with a higher priority, and probably with the memory locked down.
>
> See example code (latencytest) at:
>  http://www.gardena.net/benno/linux/audio/
> (but there is no need to run at the maximum possible priority since your
>  process will be alone anyway...)

Just a data point here -

The Andrew Morton patches have worked well for
me here - I test it often with quake 3 arena, and am
currently on 2.4.10-pre4 -

I was never successful in getting the kernel to
compile and run with any of the the other low
latency patches floating around -

cu

jjs