Date: Tue, 13 Apr 1999 04:13:53 +0200 From: Tor.Egge@fast.no To: caesar@starkreality.com Cc: freebsd-smp@FreeBSD.ORG, freebsd-current@FreeBSD.ORG Subject: Re: SMP broken in -CURRENT? Message-ID: <199904130213.EAA29557@midten.fast.no> In-Reply-To: Your message of "Mon, 12 Apr 1999 19:25:31 -0500" References: <4.1.19990412191627.009b3100@imap.colltech.com>
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> I haven't been able to get a working SMP kernel out of -CURRENT recently.
> I don't know exactly when it broke, because I usually rebuild on a weekly
> basis. The kernel hangs after:
> APIC_IO: Testing 8254 interrupt delivery
> and doesn't ever come back (panic or otherwise).
>
> The one thing that I noticed is that on the older kernels, CPU#1 is
> launched after the APIC_IO Testing and Routing. On the newer kernels,
> CPU#1 is launched far earlier.
>
> Anybody have any ideas?
You might want to try this patch, which disables the early start of CPU#1.
Index: mp_machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/i386/mp_machdep.c,v
retrieving revision 1.96
diff -u -r1.96 mp_machdep.c
--- mp_machdep.c 1999/04/11 00:43:43 1.96
+++ mp_machdep.c 1999/04/13 02:08:54
@@ -1930,9 +1930,11 @@
for (i = 0; i < mp_ncpus; i++) {
bcopy( (int *) PTD + KPTDI, (int *) IdlePTDS[i] + KPTDI, NKPDE * sizeof (int));
}
+#if 0
wait_ap(1000000);
if (smp_started == 0)
printf("WARNING: Failed to start all APs\n");
+#endif
/* number of APs actually started */
return mp_ncpus - 1;
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