Hello, On Sat, May 23, 2009 at 3:04 PM, Antoine Nourry <nourry@xxxxxxx> wrote: > why can we read everywhere that Preempt_RT offers hard real time > capabilities while on another hand we can find in some papers that it is not > deterministic and only gives assurance to obtain low latencies ? is it real > Can you give some links of one and the other? > time or not (deterministic) ? if yes, is it hard or soft RT ? Please excuse > me if i've missed something important. > This is a simplistic summary as I learned it: It's hard real-time behaviour. However, as the kernel consist of a large amount of code, every piece of code must behave properly with regard to locking etc. so that the real-time scheduler is actually able to pre-empt with low latency intervals. The tracing code has been included to find those long no-pre-empt spots in the kernel code. Regards, -- Leon -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
