From: Joel Schopp <jschopp@austin.ibm.com>
To: hagar <hagar@iinet.net.au>
Cc: lkml <linux-kernel@vger.kernel.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Nathan Lynch <nathanl@austin.ibm.com>,
Ashok Raj <ashok.raj@intel.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>
Subject: Re: Fwd: Kernel Power management ?? turning off used devices that are in use.
Date: Fri, 04 Nov 2011 10:24:48 -0500 [thread overview]
Message-ID: <4EB403C0.3040803@austin.ibm.com> (raw)
In-Reply-To: <4EB38A44.5030606@iinet.net.au>
> I need to be able to either switch off cpu hotpluging - or at least
> prevent hotplugging certain cpu's
>
> there should really be a mincpu's option or better a
> nohotplug="0,1,2,5,7,etc" option.
>
> It would appear that cpu1 is the default cpu for those interrupts -
> and they are not being transferred to cpu0 properly.
>
The proper way to fix this is to find why the interrupts are not being
transferred and fix that. Forcing cpus to not be hotpluggable is just
hiding the problem.
> I have tried the kernel parameters noapic nosmp maxcpus acpi=off
> possible_cpus=2 etc - with no success
>
> I did find a flaw in "possible_cpus=0" - this prevents the kernel
> booting (no cpus available )
> This option should be set to a minimum of 1
>
We allow users to shoot themselves in the foot if they do silly things.
This is a design decision.
next prev parent reply other threads:[~2011-11-04 15:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-25 8:37 Kernel Power management ?? turning off used devices that are in use hagar
[not found] ` <4EB38A44.5030606@iinet.net.au>
2011-11-04 6:56 ` Fwd: " hagar
2011-11-07 17:04 ` Matthew Garrett
2011-11-04 15:24 ` Joel Schopp [this message]
2011-11-05 0:07 ` hagar
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