From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Chris Friesen" Subject: Re: RFC: THE OFFLINE SCHEDULER Date: Thu, 27 Aug 2009 10:51:35 -0600 Message-ID: <4A96B997.1070001@nortel.com> References: <1251282598.3514.20.camel@raz> <1251297910.1791.22.camel@maxim-laptop> <1251298443.4791.7.camel@raz> <1251300625.18584.18.camel@twins> <1251302598.18584.31.camel@twins> <20090826180407.GA13632@elte.hu> <20090826193252.GA14721@elte.hu> <20090826135041.e6169d18.akpm@linux-foundation.org> <4A95A5EE.90400@nortel.com> <1251322663.3882.48.camel@raz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Andrew Morton , Christoph Lameter , mingo@elte.hu, peterz@infradead.org, maximlevitsky@gmail.com, efault@gmx.de, riel@redhat.com, wiseman@macs.biu.ac.il, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org To: raz ben yehuda Return-path: Received: from zrtps0kp.nortel.com ([47.140.192.56]:57762 "EHLO zrtps0kp.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752968AbZH0QwG (ORCPT ); Thu, 27 Aug 2009 12:52:06 -0400 In-Reply-To: <1251322663.3882.48.camel@raz> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On 08/26/2009 03:37 PM, raz ben yehuda wrote: > > On Wed, 2009-08-26 at 15:15 -0600, Chris Friesen wrote: >> We gave it as close to a whole cpu as we could using cpu and irq >> affinity and we used message queues in shared memory to allow another >> cpu to handle I/O. In our case we still had kernel threads running on >> the app cpu, but if we'd had a straightforward way to avoid them we >> would have used it. > Chris. I offer myself to help anyone wishes to apply OFFSCHED. I just went and read the docs. One of the things I noticed is that it says that the offlined cpu cannot run userspace tasks. For our situation that's a showstopper, unfortunately. Chris