Re: RSDL v0.31

[Stephen Clark]

Mark Hahn wrote:

> > So in an attempt to summarise the situation, what are the advantages of RSDL
> > over mainline.
> >
> > Fairness
> >    
>
> why do you think fairness is good, especially always good?
>
>  
>
> > Starvation free
> >    
>
> even starvation is sometimes a good thing - there's a place for processes
> that only use the CPU if it is otherwise idle.  that is, they are
> deliberately starved all the rest of the time.
>
>  
>
> > Much lower and bound latencies
> >    
>
> in an average sense?  also, under what circumstances does this actually
> matter?  (please don't offer something like RT audio on an overloaded machine-
> that's operator error, not something to design for.)
>
>  
>
> > Deterministic
> >    
>
> not a bad thing, but how does this make itself apparent and of value 
> to the user?  I think everyone is extremely comfortable with non-determinism
> (stemming from networks, caches, interleaved workloads, etc)
>
>  
>
> > Better interactivity for the majority of cases.
> >    
>
> how is this measured?  is this statement really just a reiteration of 
> the latency claim?
>
>  
>
> > Now concentrating on the very last aspect since that seems to be the sticking
> > point.
> >    
>
> nah, I think the fairness and latency claims are the real issues.
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>  
I guess I wonder what is wrong with the current scheduler? I am running 
2.6.20.2 on a whitebook
laptop with a core 2 duo 1.86ghz 2gb of mem with an intel 945 shared 
memory graphics processor.
I am currently running X with beryl have vncserver connected to my main 
system, which I am
using to write this email, I am running also firefox and both of ingo 
test programs. I also am running
a make -j4 on a kernel rebuild without having any pauses or any problem 
doing anything interactively.

So again what does this new scheduler fix?

Steve

--

"They that give up essential liberty to obtain temporary safety, 
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty 
decreases."  (Thomas Jefferson)



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