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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-mm1-U10.2
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On Sat, 2004-10-23 at 15:14 -0400, Lee Revell wrote:
> On Sat, 2004-10-23 at 11:51 -0700, Paul E. McKenney wrote:
> > On Fri, Oct 22, 2004 at 07:56:33PM +0200, Ingo Molnar wrote:
> > >
> > > i have released the -U10.2 Real-Time Preemption patch, which can be
> > > downloaded from:
> > >
> > > http://redhat.com/~mingo/realtime-preempt/
> >
> > On realtime-preempt-2.6.9-mm1-U10.3:
> >
> > o In rcupdate.h, I believe that the:
> >
> > +# define rcu_read_unlock_nort() rcu_read_lock_nort()
> >
> > should instead be:
> >
> > +# define rcu_read_unlock_nort() rcu_read_unlock()
> >
>
> Oh no! That would explain a lot... the typical report is it works fine
> until people go to use the network :-P

Yes and No !

The wrong define is in the #else path of CONFIG_PREEMPT_REALTIME, so it
affects the kernel only when it is built with PREEMPT_REALTIME
disabled.

The network problem with PREEMPT_REALTIME enabled is a subtle race,
which I have nearly tracked down. I know the scenario, but I have not
yet identified the culprit. (:

tglx




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