Re: PREEMPT_RT vs ADEOS: the numbers, part 1

[Sven-Thorsten Dietrich]

On Sat, 2005-06-11 at 17:44 +1000, Nick Piggin wrote:
> Ingo Molnar wrote:
> > could you send me the .config you used for the PREEMPT_RT tests? Also, 
> > you used -47-08, which was well prior the current round of performance 
> > improvements, so you might want to re-run with something like -48-06 or 
> > better.
> > 
> 
> The other thing that would be really interesting is to test latencies
> of various other kernel functionalities in the RT kernel (eg. message
> passing, maybe pipe or localhost read/write, signals, fork/clone/exit,
> mmap/munmap, faulting in shared memory, or whatever else is important
> to the RT crowd).
> 

I have recently seen an analysis of this. It was internal to a customer,
but I will ask whether they object to publishing it.

Notably, there are naturally discrepancies between user space and kernel
tasks. An example of this is thread-spawn benchmarks. That is relevant
to folks who have RT code with IP to protect that must run in user
space.

Sven


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