Date: Tue, 12 Jun 2001 18:59:04 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: wilko@FreeBSD.ORG, freebsd-alpha@FreeBSD.ORG, jhb@FreeBSD.ORG Subject: Re: followup on 8 way SMP pani Message-ID: <Pine.BSF.4.21.0106121858250.39150-100000@beppo.feral.com> In-Reply-To: <15142.48056.299034.909499@grasshopper.cs.duke.edu>
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Oh! I was really snoozing- many other things happening (mostly personal)!
This should be easy to fix- let me look at this tomorrow.
On Tue, 12 Jun 2001, Andrew Gallatin wrote:
>
> Wilko Bulte writes:
> > On Mon, Jun 11, 2001 at 10:06:56AM +0000, Wilko Bulte wrote:
> >
> > Does this make any sense to anybody? Drew, you asked for a traceback?
>
> <...>
>
> > > trap entry = 0x2 (memory management fault)
> > > cpuid = 0
> > > faulting va = 0x78
> > > type = access violation
> > > cause = load instructon
> > > pc = 0xfffffc0000491ae4
> > > ra = 0xfffffc0000491ba8
> > > sp = 0xfffffc00008d9b90
> > > usp = 0x0
> > > curproc = 0xfffffc0000831288
> > > pid = 0, comm = swapper
> > >
> > > Stopped at sync_other_counter+0x24: ldq s1,0x78(s0) <0x78>
> > > <s1=0xfffffc0000785138,s0=0x0>
> > > db> trace
> > > sync_other_counter() at sync_other_counter+0x24
> > > tc_windup() at tc_windup+0x28
> > > hardclock() at hardclock+0x1e8
> > > handleclock() at handleclock+0x22c
> > > alpha_clock_interrupt() at alpha_clock_interrupt+0x68
> > > interrupt() at interrupt+0xb8
> > > XentIntlgp() at XentIntlgp+0x14
> > > db> halt
> > >
>
> Yes, sorry I never replied. According to Matt, the turbolaser doesn't
> have an i8254 timecounter. And the alpha timecounter is never
> initialized in alpha/alpha/clock.c if ncpus>1, so you're taking a
> clock interrupt with no timecounter. Oops. No MP for TurboLasers
> right now, I guess.
>
> Here's the code in question:
>
> /*
> * XXX: TurboLaser doesn't have an i8254 counter.
> * XXX: A replacement is needed, and another method
> * XXX: of determining this would be nice.
> */
> if (hwrpb->rpb_type != ST_DEC_21000) {
> tc_init(&i8254_timecounter);
> }
>
> if (ncpus == 1) {
> alpha_timecounter.tc_frequency = freq;
> tc_init(&alpha_timecounter);
> }
>
> I think there are bigger fish to fry right now, but this needs to be
> fixed. I'm not at all sure what to do, since I don't think that
> the cycle counters on multiple cpus are in sync..
>
> Drew
>
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