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SubjectRe: stuck on TLB IPI wait (CPU#0) at 2.2.17+reiserfs+ide+raid
Andi Kleen wrote:
>
> On Mon, Sep 18, 2000 at 10:06:37AM -0600, Andreas Dilger wrote:
> > Chris, you write:
> > > > my box sometimes hang up at high load avarage with "stuck on TLB
> > > > IPI wait (CPU#0)" messages.
> > >
> > > This is a known issue with the way reiserfs uses the scheduler task queue.
> > > The following patch from Andi Kleen should take care of it for you:
> > >
> > > --- linux/kernel/sched.c-o Wed Feb 9 14:27:20 2000
> > > +++ linux/kernel/sched.c Wed Mar 29 12:53:41 2000
> > > @@ -803,6 +803,7 @@
> > > goto handle_bh_back;
> > >
> > > handle_tq_scheduler:
> > > + __sti();
> > > run_task_queue(&tq_scheduler);
> > > goto tq_scheduler_back;
> >
> > Does this have an impact on the system when not using reiserfs? What
> > is it that reiserfs does that affects the scheduler?
>
> reiserfs has a slightly longer tq_scheduler function to do the slow part
> of the end_io handler. Some kernel subsystems enter the scheduler inside
> __cli() and it does no good to execute the reiserfs task queue function
> with interrupts off (causing the stuck on TLB IPI wait messages)

The __sti() can be moved right up to the start of schedule() and
then removed from release_kernel_lock().

Or just find out who is calling schedule() with interrupts disabled
and make them stop it.
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