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Altera_Forum's avatar
Altera_Forum
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16 years ago

Soft realtime with PREEMPT-RT for NIOS II

Dear all, We have made an effort to port PREEMPT-RT on NIOS II. It is possible to use PREEMPT-RT for NIOS II (with MMU) under Linux. PREEMPT-RT is a soft realtime extension for Linux. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

This is absolutely GREAT as IMHO there will be lots of application for NIOS that will need a better realtime behavior and of course the MMU version of NIOS will be the way to go, anyway.

So I would very much like to see the "Realtime-Level" as a configurable option in the build system. AFAIK, at the moment there are two levels, your work might introduce a third one.

BTW.: what are the cons to _always_ using the realtime extensions ?

I understand that while the max latency is improved, the overall performance of the Kernel will be somewhat lower. Do you have numbers for that ?

BTW / 2.: did the lack of atomic instructions impose any problems to your work ?

-Michael