From: Aristeu Rozanski <arozansk@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, jvillalo@redhat.com
Subject: Re: [PATCH] perfctr: don't use CCCR_OVF_PMI1 on Pentium 4Ds
Date: Fri, 15 Aug 2008 08:16:14 -0400 [thread overview]
Message-ID: <20080815121614.GT7154@redhat.com> (raw)
In-Reply-To: <20080815115928.GD32726@elte.hu>
Hi Ingo,
> > Currently, setup_p4_watchdog() use CCCR_OVF_PMI1 to enable the counter
> > overflow interrupts to the second logical core. But this bit doesn't
> > work on Pentium 4 Ds (model 4, stepping 4) and this patch avoids its
> > use on these processors. [...]
>
> btw., what was the effect - an oops on bootup, or a non-working
> watchdog?
it just won't work at boot time - the second logic unit will be stuck:
Booting processor 1/2 APIC 0x1
Initializing CPU#1
Calibrating delay using timer specific routine.. 5586.12 BogoMIPS (lpj=2793063)
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 1
CPU1: Thermal monitoring enabled (TM1)
Intel(R) Pentium(R) D CPU 2.80GHz stepping 04
Brought up 2 CPUs
testing NMI watchdog ... <4>WARNING: CPU#1: NMI appears to be stuck (0->0)!
--
Aristeu
next prev parent reply other threads:[~2008-08-15 12:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-14 20:32 [PATCH] perfctr: don't use CCCR_OVF_PMI1 on Pentium 4Ds Aristeu Rozanski
2008-08-15 11:59 ` Ingo Molnar
2008-08-15 12:16 ` Aristeu Rozanski [this message]
2008-08-15 12:36 ` [PATCH] NMI: fix watchdog failure message Aristeu Rozanski
2008-08-15 13:36 ` Ingo Molnar
2008-08-15 14:02 ` Aristeu Rozanski
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