Re: Failing back to INSANE timesource :) Time stopped today.
From: Maciej W. Rozycki (macro_at_ds2.pg.gda.pl)
Date: 04/15/04
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Date: Thu, 15 Apr 2004 16:47:06 +0200 (CEST) To: Niclas Gustafsson <niclas.gustafsson@codesense.com>
On Wed, 14 Apr 2004, Niclas Gustafsson wrote:
> Watching the /proc/interrupts with 10s apart after the "stop".
>
> [root@s151 root]# more /proc/interrupts
> CPU0
> 0: 66413955 local-APIC-edge timer
[...]
> LOC: 67355837
> ERR: 0
> MIS: 0
> [root@s151 root]# more /proc/interrupts
> CPU0
> 0: 66413955 local-APIC-edge timer
[...]
> LOC: 67379568
> ERR: 0
> MIS: 0
This may be because buggy SMM firmware messes with the 8259A (configured
for a transparent mode -- yes that rare "local-APIC-edge" mode is tricky
;-) ) insanely. You've written this is an IBM box previously -- this
would be no surprise. The following patch should help -- I think it's
already included in the -mm series.
--
+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+--------------------------------------------------------------+
+ e-mail: macro@ds2.pg.gda.pl, PGP key available +
patch-2.6.5-timer_ack-2
--- linux.macro/arch/i386/kernel/io_apic.c Wed Apr 14 03:57:24 2004
+++ linux/arch/i386/kernel/io_apic.c Thu Apr 15 14:41:10 2004
@@ -2152,6 +2152,10 @@ static inline void check_timer(void)
{
int pin1, pin2;
int vector;
+ unsigned int ver;
+
+ ver = apic_read(APIC_LVR);
+ ver = GET_APIC_VERSION(ver);
/*
* get/set the timer IRQ vector:
@@ -2165,11 +2169,15 @@ static inline void check_timer(void)
* mode for the 8259A whenever interrupts are routed
* through I/O APICs. Also IRQ0 has to be enabled in
* the 8259A which implies the virtual wire has to be
- * disabled in the local APIC.
+ * disabled in the local APIC. Finally timer interrupts
+ * need to be acknowledged manually in the 8259A for
+ * do_slow_timeoffset() and for the i82489DX when using
+ * the NMI watchdog.
*/
apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
init_8259A(1);
- timer_ack = 1;
+ timer_ack = !cpu_has_tsc;
+ timer_ack |= nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver);
enable_8259A_irq(0);
pin1 = find_isa_irq_pin(0, mp_INT);
@@ -2187,7 +2195,8 @@ static inline void check_timer(void)
disable_8259A_irq(0);
setup_nmi();
enable_8259A_irq(0);
- check_nmi_watchdog();
+ if (check_nmi_watchdog() < 0)
+ timer_ack = !cpu_has_tsc;
}
return;
}
@@ -2210,7 +2219,8 @@ static inline void check_timer(void)
add_pin_to_irq(0, 0, pin2);
if (nmi_watchdog == NMI_IO_APIC) {
setup_nmi();
- check_nmi_watchdog();
+ if (check_nmi_watchdog() < 0)
+ timer_ack = !cpu_has_tsc;
}
return;
}
-
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