Date: Tue, 12 Jun 2001 21:02:48 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: wilko@freebsd.org Cc: freebsd-alpha@freebsd.org, jhb@freebsd.org Subject: Re: followup on 8 way SMP pani Message-ID: <15142.48056.299034.909499@grasshopper.cs.duke.edu> In-Reply-To: <20010613003136.A7905@freebie.xs4all.nl> References: <E159Ob2-000A5J-00@post.mail.nl.demon.net> <20010613003136.A7905@freebie.xs4all.nl>
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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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