From: linas@austin.ibm.com (Linas Vepstas)
To: David Huffman <dhuffman@storix.com>
Cc: linuxppc-dev@ozlabs.org, Nathan Lynch <ntl@pobox.com>
Subject: Re: Kernel Panic booting cdrom
Date: Mon, 23 Apr 2007 17:35:59 -0500 [thread overview]
Message-ID: <20070423223559.GT31947@austin.ibm.com> (raw)
In-Reply-To: <46292B07.3030907@storix.com>
On Fri, Apr 20, 2007 at 02:05:11PM -0700, David Huffman wrote:
> there may be power and cooling daemons that are not running and try to
> limit the system resources by limiting the number of cpus. Does this
> sound right?
As Michael Ellerman points out, the answer is no.
The idle loop specifically uses instructions that put the
cpu into low-power mode. If you don't call the idle loop, the
cpu probably won't go into low-power mode!
> The maxcpus=1 argument was something we added to our install boot
> media years ago and few here remember why it was such a great idea. The
> power/resource management was the only thing we could come up with.
Ooh, this is worthy of tatooing onto a cluestick.
--linas
prev parent reply other threads:[~2007-04-23 22:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-14 0:37 Kernel Panic booting cdrom David Huffman
2007-04-14 4:45 ` Nathan Lynch
[not found] ` <4623F574.1030804@storix.com>
[not found] ` <20070417054537.GF6062@localdomain>
2007-04-20 21:05 ` David Huffman
2007-04-23 2:10 ` Michael Ellerman
2007-04-23 22:35 ` Linas Vepstas [this message]
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