Re: rt: rtmutex experiment doubled tbench throughput

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On Tue, 2013-02-26 at 21:35 -0500, Steven Rostedt wrote: 
> On Tue, 2013-02-26 at 21:32 -0500, Steven Rostedt wrote:
> 
> > Bah! As I looked in my history I see I did the following:
> > 
> >   git show v3.0:include/linux/sched.h
> >   git show v3.2:include/linux/sched.h
> >   git show v3.4:include/linux/sched.h
> > 
> > I forgot the '-rt" on each one of them :-p
> 
> That said...
> 
> Only v3.0-rt has it. I'm barely supporting that now, and I'm only doing
> updates that might make sense. Greg should be dropping it soon, and so
> will I. There's issues in v3.0-rt that are not in v3.2-rt or above, that
> I'm not going to bother debugging.

Yeah, I'm stuck with 3.0, so my 3.0 is not as virgin as I would like it
to be.  It has threaded sirqs because I must have them, can turn cpupri
and nohz on/off on the fly because I must have to have that too to make
80 core boxen with tight jitter constraint be all they can be. 

> I'll test a patch against the others but not one against v3.0-rt.

64 core test box has microscopic root and newer kernel drivers break its
userspace.  Putting a newer rt kernel on it to play is a pita, so I do
big box tinkering in 3.0.  I can make a 3.6 hacklet during the weekend.

-Mike

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