From owner-freebsd-smp  Mon Apr 12 19:16:24 1999
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To: caesar@starkreality.com
Cc: freebsd-smp@FreeBSD.ORG, freebsd-current@FreeBSD.ORG
Subject: Re: SMP broken in -CURRENT?
From: Tor.Egge@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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Date: Tue, 13 Apr 1999 04:13:53 +0200
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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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