From: Ingo Oeser <ioe-lkml@rameria.de>
To: Paul Jackson <pj@sgi.com>
Cc: linux-kernel@vger.kernel.org, Con Kolivas <kernel@kolivas.org>,
"Derek L. Fults" <dfults@sgi.com>, devik <devik@cdi.cz>,
Dimitri Sivanich <sivanich@sgi.com>,
Dinakar Guniguntala <dino@in.ibm.com>,
Emmanuel Pacaud <emmanuel.pacaud@univ-poitiers.fr>,
Frederik Deweerdt <deweerdt@free.fr>, Ingo Molnar <mingo@elte.hu>,
Matthew Dobson <colpatch@us.ibm.com>,
Max Krasnyansky <maxk@qualcomm.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
rostedt@goodmis.org, Oleg Nesterov <oleg@tv-sign.ru>,
"Paul E. McKenney" <paulmck@us.ibm.com>,
Paul Menage <menage@google.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"Randy.Dunlap" <rddunlap@osdl.org>,
suresh.b.siddha@intel.com, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)
Date: Tue, 3 Jun 2008 00:35:55 +0200 [thread overview]
Message-ID: <200806030035.58387.ioe-lkml@rameria.de> (raw)
In-Reply-To: <20080601213019.14ea8ef8.pj@sgi.com>
Hi Paul,
in short: NAK!
On Monday 02 June 2008, Paul Jackson wrote:
> (Aside to the RealTime folks -- is there a 'realtime'
> email list which I should include in this discussion?)
>
> The kernel has a "isolcpus=" kernel boot time parameter. This
> parameter isolates CPUs from scheduler load balancing, minimizing the
> impact of scheduler latencies on realtime tasks running on those CPUs.
I used it to mask out a defect CPU on a 8-CPU node of a
HPC-cluster at a customer site, until the $BIG_VENDOR
sent a replacement. And to prove $BIG_VENDOR, that we actually
have a problem on THAT CPU.
So I would really like to keep this fault isolation capability.
I made my customer happy with that.
I wish Linux had more such "mask out bad hardware" features
to faciliate fault isolation and boot and runtime.
Best Regards
Ingo Oeser
next prev parent reply other threads:[~2008-06-02 22:36 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-02 2:30 Paul Jackson
2008-06-02 16:42 ` Dimitri Sivanich
2008-06-02 18:39 ` Max Krasnyansky
2008-06-02 21:41 ` Dimitri Sivanich
2008-06-02 21:59 ` Max Krasnyansky
2008-06-03 14:40 ` Dimitri Sivanich
2008-06-03 17:57 ` Max Krasnyanskiy
2008-06-04 14:00 ` Dimitri Sivanich
2008-06-04 18:07 ` Stop machine threads are getting preemted by the rt period enforcement Max Krasnyansky
2008-06-04 18:18 ` Peter Zijlstra
2008-06-04 18:24 ` Max Krasnyansky
2008-06-04 18:55 ` Peter Zijlstra
2008-06-04 20:14 ` Max Krasnyansky
2008-06-02 22:35 ` Ingo Oeser [this message]
2008-06-02 22:45 ` Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses) Peter Zijlstra
2008-06-02 23:04 ` Max Krasnyansky
2008-06-02 23:55 ` Ingo Oeser
2008-06-03 3:32 ` Max Krasnyansky
2008-06-03 23:47 ` Max Krasnyanskiy
2008-06-04 0:41 ` Paul Jackson
2008-06-04 4:32 ` Max Krasnyansky
2008-06-04 4:47 ` Paul Jackson
2008-06-04 12:18 ` Andi Kleen
2008-06-04 17:41 ` Paul Jackson
2008-06-04 18:29 ` Max Krasnyansky
2008-06-04 18:56 ` Peter Zijlstra
2008-06-04 19:34 ` Max Krasnyansky
2008-06-04 18:58 ` Paul Jackson
2008-06-04 19:31 ` Max Krasnyansky
2008-06-04 19:37 ` Paul Jackson
2008-06-04 19:45 ` Max Krasnyansky
2008-06-04 20:05 ` Andi Kleen
2008-06-04 20:23 ` Paul Jackson
2008-06-04 20:03 ` Andi Kleen
2008-06-04 20:16 ` Paul Jackson
2008-06-04 20:33 ` Andi Kleen
2008-06-04 20:38 ` Paul Jackson
2008-06-04 21:16 ` Max Krasnyansky
2008-06-04 21:17 ` Paul Jackson
2008-06-04 21:20 ` Max Krasnyansky
2008-06-04 21:26 ` Paul Jackson
2008-06-04 1:18 ` Nick Piggin
2008-06-04 3:00 ` Max Krasnyansky
2008-06-04 16:18 ` Ingo Oeser
2008-06-04 17:47 ` Max Krasnyansky
2008-06-03 6:03 ` Nick Piggin
2008-06-04 9:58 ` Mark Hounschell
2008-06-04 17:26 ` Paul Jackson
2008-06-04 21:00 ` Mark Hounschell
2008-06-04 21:03 ` Paul Jackson
2008-06-04 19:26 ` Max Krasnyansky
2008-06-04 20:25 ` Peter Zijlstra
2008-06-04 21:44 ` Michael Trimarchi
2008-06-04 21:52 ` Peter Zijlstra
2008-06-05 11:16 ` Michael Trimarchi
2008-06-05 12:07 ` Peter Zijlstra
2008-06-05 14:57 ` Michael Trimarchi
2009-05-08 2:48 ` GeunSik Lim
2008-06-05 11:44 ` Mark Hounschell
2008-06-06 22:28 ` Max Krasnyanskiy
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