From owner-freebsd-smp  Mon Apr 12 20:34:38 1999
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Date: Mon, 12 Apr 1999 22:31:28 -0500
To: Tor.Egge@fast.no
From: "William S. Duncanson" <caesar@starkreality.com>
Subject: Re: SMP broken in -CURRENT?
Cc: freebsd-smp@FreeBSD.ORG, freebsd-current@FreeBSD.ORG
In-Reply-To: <199904130213.EAA29557@midten.fast.no>
References: <Your message of "Mon, 12 Apr 1999 19:25:31 -0500">
 <4.1.19990412191627.009b3100@imap.colltech.com>
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That fixes it, thanks.

At 04:13 4/13/99 +0200, Tor.Egge@fast.no wrote:
>> 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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William S. Duncanson                      caesar@starkreality.com
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is inexpensive and easy to use if they choose to do that.  -- Scott Adams 


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