From: Matthew Garrett <mjg59@srcf.ucam.org>
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>,
Joel Schopp <jschopp@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: Mon, 7 Nov 2011 17:04:58 +0000 [thread overview]
Message-ID: <20111107170458.GA23257@srcf.ucam.org> (raw)
In-Reply-To: <4EB38C99.10809@iinet.net.au>
On Fri, Nov 04, 2011 at 02:56:25PM +0800, hagar wrote:
>
> I have traced this behaviour to the cpu hotplug code.
>
> I need to be able to either switch off cpu hotpluging - or at least
> prevent hotplugging certain cpu's
The kernel doesn't automatically hotplug CPUs on idle. Something in your
userspace is doing so. I think that Ubuntu's powernap will do so under
certain circumstances - try disabling that if you have it.
(Which doesn't alter the fact that there appears to be a bug here)
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2011-11-07 17:05 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 [this message]
2011-11-04 15:24 ` Joel Schopp
2011-11-05 0:07 ` hagar
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