From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752067Ab1KEAIE (ORCPT ); Fri, 4 Nov 2011 20:08:04 -0400 Received: from outbound.icp-osb-irony-out8.iinet.net.au ([203.59.1.134]:13789 "EHLO outbound.icp-osb-irony-out8.iinet.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751747Ab1KEAID (ORCPT ); Fri, 4 Nov 2011 20:08:03 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBADd+tE46B7JU/2dsb2JhbAAMOKdwhQ0BAQEEOEABEAsJBAEKCRYPCQMCAQIBRQYKAwEHAQG+JYkrBIgIhHmHG4VQjCM X-IronPort-AV: E=Sophos;i="4.69,458,1315152000"; d="scan'208";a="166138398" Message-ID: <4EB47E49.7070303@iinet.net.au> Date: Sat, 05 Nov 2011 08:07:37 +0800 From: hagar User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20111031 Thunderbird/7.0.1 MIME-Version: 1.0 To: Joel Schopp CC: lkml , Rusty Russell , Srivatsa Vaddagiri , Zwane Mwaikambo , Nathan Lynch , Ashok Raj , Heiko Carstens Subject: Re: Fwd: Kernel Power management ?? turning off used devices that are in use. References: <4EA67567.3020704@iinet.net.au> <4EB38A44.5030606@iinet.net.au> <4EB403C0.3040803@austin.ibm.com> In-Reply-To: <4EB403C0.3040803@austin.ibm.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/11/11 23:24, Joel Schopp wrote: > >> 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. > But it does allow the computer to become usable. At the moment it is extremely borderline. So much so that I would rather a non smp kernel and run off one cpu. I have difficulty keeping the network up. I have to run a cron job every minute to check the network and restart it if necessary. Watching an hour long streaming video is impossible without moving the usb mouse constantly. I am even considering a change of OS due to this 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. > Quite amusing.