Date: Tue, 31 Mar 1998 01:32:41 +0200 From: Tor Egge <Tor.Egge@idi.ntnu.no> To: ben@stuyts.nl, benst@terminus.stuyts.nl Cc: smp@FreeBSD.ORG Subject: Re: Log messages from latest SMP kernel Message-ID: <199803302332.BAA12765@pat.idi.ntnu.no> In-Reply-To: Your message of "Mon, 30 Mar 98 22:42:30 %2B0200" References: <199803302042.WAA05032@daneel.stuyts.nl>
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> Running a kernel from about March 27, I get a lot of log messages like this:
>
> > sio2: 3 more interrupt-level buffer overflows (total 69)
> > forward_hardclock: checkstate 0
> > forward_hardclock: checkstate 0
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
There are two explanations for this error message
1. Failed IPI delivery.
- Interrupts are disabled on the other CPU
- The local apic TPR register value on the other CPU is too high,
blocking the IPI
2. Successful IPI delivery not detected
- Incorrect declaration of some variables (missing volatile decl.).
If the second explanation is correct for your case, the following patch
might help you.
Index: sys/i386/include/smp.h
===================================================================
RCS file: /home/ncvs/src/sys/i386/include/smp.h,v
retrieving revision 1.40
diff -u -r1.40 smp.h
--- smp.h 1998/03/07 21:34:59 1.40
+++ smp.h 1998/03/30 22:22:23
@@ -78,8 +78,8 @@
extern volatile u_int stopped_cpus;
extern volatile u_int started_cpus;
-extern unsigned int checkstate_probed_cpus;
-extern unsigned int checkstate_need_ast;
+extern volatile u_int checkstate_probed_cpus;
+extern volatile u_int checkstate_need_ast;
/* functions in apic_ipl.s */
void apic_eoi __P((void));
- Tor Egge
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