From: William Lee Irwin III <wli@holomorphy.com>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Martin Wilck <Martin.Wilck@fujitsu-siemens.com>,
Ingo Molnar <mingo@elte.hu>,
Linux Kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Severe IRQ problems on Foster (P4 Xeon) system
Date: Wed, 20 Mar 2002 12:24:01 -0800 [thread overview]
Message-ID: <20020320202401.GA785@holomorphy.com> (raw)
In-Reply-To: <Pine.LNX.4.33.0203131912140.1477-100000@biker.pdb.fsc.net> <Pine.GSO.3.96.1020319145208.12399I-100000@delta.ds2.pg.gda.pl>
On Tue, Mar 19, 2002 at 03:32:22PM +0100, Maciej W. Rozycki wrote:
> The value is correct as after issuing the poll i8259 command the next
> read cycle to the PIC returns an IRQ level (0x07 = no IRQ active; it
> shouldn't happen here -- 0x80 is expected for active IRQ 0).
On Wed, 13 Mar 2002, Martin Wilck wrote:
>> inb(0x20) call is not captured in our protocol, it must occur long after
>> the error. (We saw normal execution of the above code fragment where
>> there is ~1us between the outb and inb, where it is >120us here).
There is/was at least one simulator that shoots the kernel (and
everything else) dead in response to frobbing the PIC while the local
APIC timer etc. are going, and I wouldn't be surprised if there were
some real hardware that did so as well.
(this is the code under if (timer_ack) in do_timer_interrupt())
Cheers,
Bill
next prev parent reply other threads:[~2002-03-20 20:24 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-13 19:11 Severe IRQ problems on Foster (P4 Xeon) system Martin Wilck
2002-03-13 19:10 ` Ingo Molnar
2002-03-13 22:22 ` Bill Davidsen
2002-03-13 22:51 ` Alan Cox
2002-03-14 5:29 ` rddunlap
2002-03-14 14:26 ` Alan Cox
2002-03-15 7:55 ` Ingo Molnar
2002-03-14 13:29 ` Martin Wilck
2002-03-14 14:34 ` Martin J. Bligh
2002-03-14 18:22 ` Martin J. Bligh
2002-03-15 7:50 ` Ingo Molnar
2002-03-15 7:43 ` Ingo Molnar
2002-03-15 18:08 ` Martin J. Bligh
2002-03-19 13:38 ` Maciej W. Rozycki
2002-03-19 13:11 ` Maciej W. Rozycki
2002-03-27 17:35 ` Steffen Persvold
2002-03-19 14:32 ` Maciej W. Rozycki
2002-03-19 16:39 ` Martin Wilck
2002-03-19 23:28 ` Pavel Machek
2002-03-20 7:52 ` Martin Wilck
2002-03-20 13:27 ` Maciej W. Rozycki
2002-03-20 13:47 ` Martin Wilck
2002-03-20 14:13 ` Maciej W. Rozycki
2002-03-20 14:29 ` Alan Cox
2002-03-21 18:53 ` Martin Wilck
2002-03-20 13:52 ` Maciej W. Rozycki
2002-03-20 16:19 ` Martin Wilck
2002-03-21 13:03 ` Maciej W. Rozycki
2002-03-20 20:24 ` William Lee Irwin III [this message]
2002-03-21 6:54 ` Zwane Mwaikambo
2002-03-21 23:35 ` William Lee Irwin III
2002-03-22 0:18 ` Maciej W. Rozycki
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