From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754428Ab2AaErb (ORCPT ); Mon, 30 Jan 2012 23:47:31 -0500 Received: from mailout-de.gmx.net ([213.165.64.22]:38829 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753870Ab2AaEra (ORCPT ); Mon, 30 Jan 2012 23:47:30 -0500 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/GXlpuv4XGbg/oDC+kc3Mkyn4P+qXGfoRuYbqnv3 EWoMblslId9RD5 Message-ID: <1327985246.6667.8.camel@marge.simson.net> Subject: Re: isolcpus question From: Mike Galbraith To: Gene Heskett Cc: LKML Date: Tue, 31 Jan 2012 05:47:26 +0100 In-Reply-To: <201201302213.39672.gene.heskett@gmail.com> References: <201201302213.39672.gene.heskett@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.1 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2012-01-30 at 22:13 -0500, Gene Heskett wrote: > Which is, is there a isolcpus troubleshooting tool? > > I have an app that is supposed to use the 2nd cpu on a 2 core atom system > all by itself, and its insisting on using cpu0 when the boot command line > has "isolcpus=1" appended to it, and apparently I am the only one with the > problem, its working for about 200-500 others running the same software. isolcpus=1 isolates CPU1 so no task will automatically end up using it, but it's up to your task (or you) to move to the isolated CPU. Pin your task to CPU1 with taskset, and all should work fine. -Mike