Date: Mon, 12 Apr 1999 22:31:28 -0500 From: "William S. Duncanson" <caesar@starkreality.com> To: Tor.Egge@fast.no Cc: freebsd-smp@FreeBSD.ORG, freebsd-current@FreeBSD.ORG Subject: Re: SMP broken in -CURRENT? Message-ID: <4.1.19990412222940.03bde1e0@fire.starkreality.com> 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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