From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yinghai Lu Subject: Re: [PATCH]: x86: use acpi flags for apic mapping Date: Thu, 03 Jun 2010 14:30:52 -0700 Message-ID: <4C081F0C.8060504@oracle.com> References: <20100602192418.2706.35192.sendpatchset@prarit.bos.redhat.com> <20100602194956.GB5264@lenovo> <4C06D91F.2060105@redhat.com> <20100603172126.GA5502@lenovo> <4C07EF69.6050301@redhat.com> <4C0817CE.6050006@oracle.com> <4C081B4A.4060801@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from rcsinet10.oracle.com ([148.87.113.121]:64516 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754710Ab0FCVcb (ORCPT ); Thu, 3 Jun 2010 17:32:31 -0400 In-Reply-To: <4C081B4A.4060801@redhat.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Prarit Bhargava Cc: Cyrill Gorcunov , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, mjg@redhat.com, x86@kernel.org, Thomas Gleixner , "H. Peter Anvin" , Suresh Siddha On 06/03/2010 02:14 PM, Prarit Bhargava wrote: > >> It seems we don't need this patch. >> >> so all system should support phys apic mode, but system with less 8 cpus is supposed to support cluster mode for better performance. >> >> current kernel will try to use cluster mode if nr_cpus is less than 8. >> >> some system have problem like IBM and NCR only support phys apic mode even cpus < 8 ... >> >> > > What about systems that have set the ACPI values? We just ignore those > then? we checked the value to see if it only support phys apic mode. Yinghai