From: Andi Kleen <ak@suse.de>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Andi Kleen <ak@suse.de>,
richardj_moore@uk.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: Why is double_fault serviced by a trap gate?
Date: Thu, 7 Dec 2000 19:29:58 +0100 [thread overview]
Message-ID: <20001207192958.A32075@gruyere.muc.suse.de> (raw)
In-Reply-To: <20001207190535.A31574@gruyere.muc.suse.de> <Pine.GSO.3.96.1001207190920.21086K-100000@delta.ds2.pg.gda.pl>
In-Reply-To: <Pine.GSO.3.96.1001207190920.21086K-100000@delta.ds2.pg.gda.pl>; from macro@ds2.pg.gda.pl on Thu, Dec 07, 2000 at 07:11:57PM +0100
On Thu, Dec 07, 2000 at 07:11:57PM +0100, Maciej W. Rozycki wrote:
> On Thu, 7 Dec 2000, Andi Kleen wrote:
>
> > How often does the NMI watchdog handler run ?
>
> HZ times per second.
Interesting. One of my ports references for PCs lists
0044 r/w PIT counter 3 (PS/2, EISA)
used as fail-safe timer. generates an NMI on time out.
for user generated NMI see at 0462.
I don't know if modern PCs still provide this counter, but if yes it could
be used for a slow NMI watchdog that only runs every 30s or so.
-Andi
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next prev parent reply other threads:[~2000-12-07 19:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-07 16:04 richardj_moore
2000-12-07 16:13 ` Andi Kleen
2000-12-07 16:31 ` Richard B. Johnson
2000-12-07 16:55 ` Maciej W. Rozycki
2000-12-07 18:05 ` Andi Kleen
2000-12-07 18:11 ` Maciej W. Rozycki
2000-12-07 18:29 ` Andi Kleen [this message]
2000-12-07 18:47 ` Maciej W. Rozycki
2000-12-07 18:13 Petr Vandrovec
2000-12-07 18:04 ` Maciej W. Rozycki
2000-12-07 20:20 Petr Vandrovec
2000-12-07 19:38 ` Maciej W. Rozycki
2000-12-07 21:09 richardj_moore
2000-12-07 21:44 ` Richard B. Johnson
2000-12-07 22:36 ` Brian Gerst
2000-12-08 1:36 ` Richard B. Johnson
2000-12-08 11:44 ` Maciej W. Rozycki
2000-12-07 22:47 ` Keith Owens
2000-12-08 11:30 ` Maciej W. Rozycki
2000-12-07 23:01 Petr Vandrovec
2000-12-07 23:03 richardj_moore
2000-12-07 23:08 richardj_moore
2000-12-08 8:37 richardj_moore
2000-12-08 12:58 ` Richard B. Johnson
2000-12-08 22:34 ` Keith Owens
2000-12-08 20:31 ` Mikulas Patocka
2000-12-08 13:18 richardj_moore
2000-12-08 16:34 richardj_moore
2000-12-08 16:52 ` Richard B. Johnson
2000-12-08 20:48 richardj_moore
2000-12-09 23:46 richardj_moore
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