Date: Fri, 8 Jun 2001 11:38:21 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: Wilko Bulte <wkb@freebie.demon.nl>, <freebsd-alpha@freebsd.org> Subject: Re: 8 CPU SMP attempt Message-ID: <Pine.BSF.4.33.0106081137590.23664-100000@herring.nlsystems.com> In-Reply-To: <15135.56068.265334.399553@grasshopper.cs.duke.edu>
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On Thu, 7 Jun 2001, Andrew Gallatin wrote:
>
> Wilko Bulte writes:
> >
> > Possible. I cannot really try as the smallest config would be a single
> > CPU board housing 2 CPUs. Or do we honor the maxcpus (or whatever it
> > is called..) SRM variable?
>
> "whatever its called" works, at least on Matt's 4100, so you could see if a
> dual or single processor config boots. I think its just a bitmask of
> available CPUs on most (all?) platforms.
I use this patch to ignore all except the first secondary CPU.
Index: mp_machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/alpha/alpha/mp_machdep.c,v
retrieving revision 1.20
diff -u -r1.20 mp_machdep.c
--- mp_machdep.c 2001/05/15 23:22:17 1.20
+++ mp_machdep.c 2001/05/22 13:17:13
@@ -363,13 +363,14 @@
}
all_cpus |= 1 << i;
mp_ncpus++;
+ break;
}
PCPU_SET(other_cpus, all_cpus & ~(1 << boot_cpu_id));
for (i = 0; i < hwrpb->rpb_pcs_cnt; i++) {
if (i == boot_cpu_id)
continue;
- if (all_cpus & 1 << i)
+ if (all_cpus & 1 << i)
smp_start_secondary(i);
}
}
--
Doug Rabson Mail: dfr@nlsystems.com
Phone: +44 20 8348 6160
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